90
Everything about the number 90 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 90
| Nominal | 90 |
| Cardinal | ninety |
| Ordinal | 90th |
| This number as US currency | ninety dollars |
Properties (and some facts) of 90
| 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 |
| Is 90 a triangle number? | 90 is not a triangle number |
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90 in other bases
| Base 2 (Binary) | 1011010 |
| Base 3 (Ternary) | 10100 |
| Base 4 (Quaternary) | 1122 |
| Base 5 (Quinary) | 330 |
| Base 6 (Senary) | 230 |
| Base 8 (Octal) | 132 |
| Base 12 (Duodecimal) | 76 |
| Base 16 (Hexadecimal) | 5A |
| Base 20 (Vigesimal) | 4A |
Primes and factors tests for 90
| Is 90 a prime number? | 90 is not a prime number |
| 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 |
90 in other numeral systems
| 90 in Roman numerals | XC |
| 90 in Chinese numerals | 玖拾 |
| 90 in Babylonian numerals |   |
| 90 in Egyptian numerals | 𓎎 |
Roots and squares 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 90 | 9.4868329805051 |
| Cube root of 90 | 4.4814047465572 |
Recreational math for 90
| Number 90 reversed | 09 |
| Sum of the digits | 9 |
| Number of digits | 2 |
Arithmetic tables for 90
Other pages about 90
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