# 90 (number)

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90 (number)

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

90
Cardinal ninety
Ordinal 90th
(ninetieth)
Numeral system 90
Factorization $2 \cdot 3^2 \cdot 5$
Divisors 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
Roman numeral XC
Binary 10110102
Octal 1328
Duodecimal 7612
Interstate 90 is a freeway that runs from Washington to Massachusetts.

## In mathematics

• 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.[1] 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 religion

Ninety of the Psalm are credited to Moses; some credit the ninety-first psalm to him as well.

## In sports

• Nike Total 90 Apparel is a brand name of football apparel and football equipment from equipment bags to goalkeeper gloves
• Major League baseball bases are 90 feet (27 m) away in distance
• The car number most associated with former NASCAR team owner Junie Donlavey
• The number of minutes in a football (soccer) match.

## In Wellness Plans

• P90X is a rigorous work out plan for 90 days with proclaimed incredible results.

## References

Wikimedia Foundation. 2010.

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