Names of 90
| Nominal | 90 |
| Cardinal | ninety |
| Ordinal | 90th |
| This number as US currency | ninety dollars |
| Is 90 an odd number? | 90 is NOT an odd number |
| Is 90 an even number? | 90 is an even number |
| Is 90 a palindrome? | 90 is NOT a palindrome number |
| Is 90 a triangle number? | 90 is NOT a triangle number |
90 in other Bases
| Base 2 (Binary) | 10110102 |
| Base 3 (Ternary) | 101003 |
| Base 4 (Quaternary) | 11224 |
| Base 5 (Quinary) | 3305 |
| Base 6 (Senary) | 2306 |
| Base 8 (Octal) | 1328 |
| Base 12 (Duodecimal) | 7612 |
| Base 16 (Hexadecimal) | 5A16 |
| Base 20 (Vigesimal) | 4A20 |
Primes and Factors tests for 90
| Is 90 a Prime Number? | 90 is NOT a prime |
| Is 90 a perfect number? | 90 is NOT a perfect number |
| Is 90 a Mersenne Prime? | 90 is NOT a Mersenne prime |
| Is 90 a Fermat Prime? | 90 is NOT a Fermat prime |
| Is 90 a Fibonacci Prime? | 90 is NOT a Fibonacci prime |
| Is 90 a Partition Prime? | 90 is NOT a Partition prime |
| Is 90 a Pell Prime? | 90 is NOT a Pell prime |
| Prime Factors | Prime factors of 90 |
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90 in other Numerals
| 90 in Roman Numeral | XC |
| 90 in Chinese Numeral | 玖拾 |
| 90 in Egyptian Numeral | 𓎎 |
| 90 in Babylonian Numeral |   |
Roots and stuff for 90
| Is 90 a square number? | 90 is NOT a square number |
| Is 90 a cube number? | 90 is NOT a cube number |
| Square root of the number 90 | 9.4868329805051 |
| Cube root of the number 90 | 4.4814047465572 |
Recreational math for 90
| Number 90 reversed | 09 |
| Sum of the digits | 9 |
| No of digits | 2 |