90 (number)
90 (ninety) is the natural number following 89 and preceding 91.
Look up ninety in Wiktionary, the free dictionary.
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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, xc | |||
| Binary | 10110102 | |||
| Ternary | 101003 | |||
| Senary | 2306 | |||
| Octal | 1328 | |||
| Duodecimal | 7612 | |||
| Hexadecimal | 5A16 | |||
| Armenian | Ղ | |||
| Hebrew | צ / ץ | |||
| Babylonian numeral | 𒐕𒌍 | |||
| Egyptian hieroglyph | 𓎎 | |||
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/.