90 (number)
90 (ninety) is the natural number preceded by 89 and followed by 91.
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| Cardinal | ninety | |||
| Ordinal | 90th (ninetieth) | |||
| Factorization | 2 × 32 × 5 | |||
| Divisors | 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 | |||
| Greek numeral | Ϟ´ | |||
| Roman numeral | XC | |||
| Binary | 10110102 | |||
| Ternary | 101003 | |||
| Quaternary | 11224 | |||
| Quinary | 3305 | |||
| Senary | 2306 | |||
| Octal | 1328 | |||
| Duodecimal | 7612 | |||
| Hexadecimal | 5A16 | |||
| Vigesimal | 4A20 | |||
| Base 36 | 2I36 | |||
In the English language, the numbers 90 and 19 are often confused, as they sound very similar. When carefully enunciated, they differ in which syllable is stressed: 19 /naɪnˈtiːn/ vs 90 /ˈnaɪnti/. However, in dates such as 1999, and when contrasting numbers in the teens and when counting, such as 17, 18, 19, the stress shifts to the first syllable: 19 /ˈnaɪntiːn/.
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Look up ninety in Wiktionary, the free dictionary. |
In mathematics
90 is:
- a unitary perfect number because it is the sum of its unitary divisors (excluding itself).[1]
- a semiperfect number because it is equal to the sum of a subset of its divisors.[2]
- a pronic number.[3]
- a nontotient.[4]
- a Perrin number, preceded in the sequence by 39, 51, 68.[5]
- a Harshad number since 90 is divisible by the sum of its base 10 digits.[6]
In normal space, the interior angles of a rectangle 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.[7] Thus, an angle measuring 90 degrees is called a right angle.[8]
In science
Ninety is:
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
In other fields
- +90 is the code for international direct dial phone calls to Turkey.
- 90 is the code for the French département Belfort.
gollark: I would be unsurprised if at least 10% of linked list use wasn't just because linked lists are mildly easier to implement yourself in C than vectors.
gollark: - macro for automatically generating yet another linked list implementation for some reason
gollark: Oh, I had another gollarC idea: - fearless concurrency via an optional setting to deny all inter-thread shared memory access.
gollark: With subtle minor differences.
gollark: osmarkslibc™ will of course ship strlen, stlren and strlne.
References
- "Sloane's A002827 : Unitary perfect numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
- "Sloane's A005835 : Pseudoperfect (or semiperfect) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
- "Sloane's A002378 : Oblong (or promic, pronic, or heteromecic) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
- "Sloane's A005277 : Nontotients". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
- "Sloane's A001608 : Perrin sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
- "Sloane's A005349 : Niven (or Harshad) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
- http://www.sparknotes.com/testprep/books/newsat/chapter20section4.rhtml
- Friedman, Erich. What's Special About This Number?
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