Information about 90 (number)

"Ninety" redirects here. It is also often used^[1] as a name of endearment for Nintendo.

90 (ninety) is the natural number preceded by 89 and followed by 91.

← 90 91 92 93 94 95 96 97 98 99 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	90 ninety
Ordinal	90th ninetieth
Factorization	$\text{[math]}$
Divisors	1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
Roman numeral	XC
Roman numeral (Unicode)	XC, xc
Binary	1011010
Octal	132
Duodecimal	76
Hexadecimal	5A
Hebrew	צ (Tsadi)

In mathematics

90 is the sum of the squares of the integers 2 to 6. Because 90 is the sum of its unitary divisors (excluding itself), it is a unitary perfect number, and because it is equal to the sum of a subset of its divisors, it is a semiperfect number. 90 is a pronic number. But it is also a nontotient. It is a Perrin number, preceded in the sequence by 39, 51, 68.

In normal space, the interior angles of a square measure 90 degrees each. Also, in a right triangle, the angle opposing the hypotenuse measures 90 degrees, with the other two angles adding up to 90 for a total of 180 degrees. Thus, an angle measuring 90 degrees is called a right angle.^[2]

90 is divisible by the sum of its base 10 digits, thus it is a Harshad number.

In astronomy

Messier object M90, a magnitude 11.0 spiral galaxy in the constellation Virgo
The New General Catalogue object NGC 90, a barred spiral galaxy in the constellation Andromeda
The Saros number of the solar eclipse series which began on 134 BC September 28 and ended on 1345 March 4. The duration of Saros series 90 was 1478.4 years, and it contained 83 solar eclipses.
The Saros number of the lunar eclipse series which began on 150 June 27 and ended on 1430 August 4. The duration of Saros series 90 was 1280.1 years, and it contained 72 lunar eclipses.

In other fields

Ninety is:

The year AD 90, 90 BC, or 1990.
The 1890’s were known as the Gay Nineties
Abbott and Costello "The Naughty Nineties" film (1945)
The atomic number of thorium, an actinide.
The atomic weight of an isotope of strontium, a by-product of nuclear reactions including fallout. It contaminates milk.
The latitude of the North Pole and the South Pole.
The designation of United States Interstate 90, a freeway that runs from Washington to Massachusetts.
The code for international direct dial phone calls to Turkey.
The ISBN Group Identifier for books published in the Netherlands.
The Soviet T-90 tank is the most modern in the Russian arsenal.
The number of minutes in a football match.
In the song "My Grandfather's Clock" by Henry Clay Work, the number of years the clock stood on the floor.
Was the percent chance that the employees of Colonies.com had of getting paid on Monday the 11th of June; it turns out it should have been 0%.
The number of a psalm credited to Moses; the ninety-first psalm is also likely his work as well.
90 minute cassette tapes
"90 Miles An Hour (Down A Dead End Street" by Hank Snow
Mission 90 Days film (2007)
"Bob Hope: The First 90 Years" TV special aired on NBC on May 14, 1993)
Joe 90, a 1968 U.K. TV series, set in 2012
Power 90 weight loss and body transformation program
Ultra 90, weight loss program
Playhouse 90, a 90-minute long dramatic CBS TV series from 1956-61
Cuba is 90 miles off the Florida coast
Gloria Estefan "90 Millas" CD (90 miles)
Eli Wallach starred in "The Holiday" in 2006 at 90
Nokia E90 Communicator
David Hasselhoff and "Knight Rider" aired for 90 episodes from 1982 - 1986
by Don Piper

In sports

Nike Total 90 Apparel is a brand name of apparel and sports equipment from equipment bags to goalkeeper gloves
Major League baseball bases are 90 feet away in distance
The car number most associated by former NASCAR team owner Junie Donlavey

References

1. ^ Various fanboys and fansites use this nickname. See for example Ninty.net and the South African Nintendo Community.
2. ^ Friedman, Erich. What's Special About This Number?

term of endearment is a word or phrase used to address and/or describe a person or animal for which the speaker feels love or affection. Terms of endearment are used for a variety of reasons, ranging from parents addressing their children, to lovers whispering sweet nothings to
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Nintendo Company, Limited
任天堂株式会?

Public
TYO: 7974
NTDOY
FWB: NTO
Founded September 23 1889
Headquarters Kyoto, Japan
International:
Redmond, Washington, USA
Richmond, British Columbia, Canada
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In mathematics, a natural number can mean either an element of the set (i.e the positive integers or the counting numbers) or an element of the set (i.e. the non-negative integers).
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89 (eighty-nine) is the natural number following 88 and preceding 90.

In mathematics

Eighty-nine is the 24th prime number, following 83 and preceding 97. 89 is a Chen prime.
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91 (ninety-one) is the natural number following 90 and preceding 92.

In mathematics

Ninety-one is a triangular number and a hexagonal number, one of the few such numbers to also be a centered hexagonal number, and it is also a centered nonagonal number
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89 (eighty-nine) is the natural number following 88 and preceding 90.

In mathematics

Eighty-nine is the 24th prime number, following 83 and preceding 97. 89 is a Chen prime.
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91 (ninety-one) is the natural number following 90 and preceding 92.

In mathematics

92 (ninety-two) is the natural number following 91 and preceding 93.

In mathematics

Ninety-two is a pentagonal number. It is also:

The number of Johnson solids.

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93 (ninety-three) is the natural number following 92 and preceding 94.

In mathematics

Given 93 the Mertens function returns 0.

There are 93 solutions to Znám's problem for length 8.

93 is a repdigit in base 5 (333).
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94 (ninety-four) is the natural number following 93 and preceding 95.

In mathematics

94 is a 17-gonal number, a Smith number, and a nontotient.
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95 (ninety-five) is the natural number following 94 and preceding 96.

In mathematics

95 is an 11-gonal number. At ninety-five, the Mertens function sets a new high of 2, after being below 0 for most of the numbers from 3 to 92.
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For the Australian TV series see Number 96 (TV series)

96 (ninety-six) is the natural number following 95 and preceding 97.

In mathematics

Ninety-six is an octagonal number, a refactorable number and an untouchable number.
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97 (ninety-seven) is the natural number following 96 and preceding 98.

In mathematics

97 is the 25th prime number (the largest two-digit prime number in base 10), following 89 and preceding 101. 97 is a Proth prime as it is 3 × 2⁵ + 1.
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98 (ninety-eight) is the natural number following 97 and preceding 99.

In mathematics

Ninety-eight is a Wedderburn-Etherington number and a nontotient.

In astronomy

Messier 98, a magnitude 11.
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In mathematics

Ninety-nine is the ninth repdigit, a palindromic number and a Kaprekar number.

It is the sum of divisors of the first eleven positive integers.

In science

The atomic number of einsteinium, an actinide.

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100 (one hundred) (the Roman numeral is C for centum) is the natural number following 99 and preceding 101.

In mathematics

One hundred is the square of 10 (in scientific notation it is written as ).
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This is a list of articles about numbers (not about numerals).

Rational numbers

Notable rational numbers

Natural numbers

0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19
20 21 22 23 24 25 26 27 28 29
30 31 32 33 34 35 36 37 38 39
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The integers (from the Latin integer, which means with untouched integrity, whole, entire) are the set of numbers including the whole numbers (0, 1, 2, 3, …) and their negatives (0, −1, −2, −3, …).
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0 (zero) is both a number and a numerical digit used to represent that number in numerals. It plays a central role in mathematics as the additive identity of the integers, real numbers, and many other algebraic structures.
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10 (ten) is an even natural number following 9 and preceding 11.

← 0

→

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30 (thirty) is the natural number following 29 and preceding 31.

In mathematics

It is a primorial as well as the sum of the squares of the integers 1, 2, 3 and 4. It is the smallest Giuga number.
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40 (forty) is the natural number following 39 and preceding 41.

Despite being related to the word "four" (4), 40 is spelled as "forty", not "fourty". The letters of the word "forty" are in alphabetical order; this is the only number that has this linguistic property
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50 (fifty) is the integer following 49 and preceding 51.
(the number fifty derives from the two numerical figures of both 0 and 5 placed in order from greatest to least)

In mathematics

Fifty
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60 (sixty) is the natural number following 59 and preceding 61. Being thrice twenty, 60 is called "three score" in some older literature.

In mathematics

Sixty
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70 (seventy) is the natural number following 69 and preceding 71. The French do not have a word for 70, instead using "soixante-dix" (60 + 10). Other French-speaking countries such as Belgium and Switzerland do have a word for it, using "septante.
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80 (eighty) is the natural number following 79 and preceding 81.

In mathematics

The sum of Euler's totient function φ(x) over the first sixteen integers is 80.

Adding up some subsets of its divisors (e.g.
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100 (one hundred) (the Roman numeral is C for centum) is the natural number following 99 and preceding 101.

In mathematics

One hundred is the square of 10 (in scientific notation it is written as ).
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cardinal numbers, or cardinals for short, are a generalized kind of number used to denote the size of a set, known as its cardinality. For finite sets the cardinality is given by a natural number, being simply the number of elements in the set.
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ordinal, ordinal number, and transfinite ordinal number refer to a type of number introduced by Georg Cantor in 1897, to accommodate infinite sequences and to classify sets with certain kinds of order structures on them.
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