Names of 640
| Nominal | 640 |
| Cardinal | six hundred forty |
| Ordinal | 640th |
| This number as US currency | six hundred forty dollars |
| Is 640 an odd number? | 640 is NOT an odd number |
| Is 640 an even number? | 640 is an even number |
| Is 640 a palindrome? | 640 is NOT a palindrome number |
| Is 640 a triangle number? | 640 is NOT a triangle number |
640 in other Bases
| Base 2 (Binary) | 10100000002 |
| Base 3 (Ternary) | 2122013 |
| Base 4 (Quaternary) | 220004 |
| Base 5 (Quinary) | 100305 |
| Base 6 (Senary) | 25446 |
| Base 8 (Octal) | 12008 |
| Base 12 (Duodecimal) | 45412 |
| Base 16 (Hexadecimal) | 28016 |
| Base 20 (Vigesimal) | 1C020 |
Primes and Factors tests for 640
| Is 640 a Prime Number? | 640 is NOT a prime |
| Is 640 a perfect number? | 640 is NOT a perfect number |
| Is 640 a Mersenne Prime? | 640 is NOT a Mersenne prime |
| Is 640 a Fermat Prime? | 640 is NOT a Fermat prime |
| Is 640 a Fibonacci Prime? | 640 is NOT a Fibonacci prime |
| Is 640 a Partition Prime? | 640 is NOT a Partition prime |
| Is 640 a Pell Prime? | 640 is NOT a Pell prime |
| Prime Factors | Prime factors of 640 |
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640 in other Numerals
| 640 in Roman Numeral | DCXL |
| 640 in Chinese Numeral | 陸佰肆拾 |
| 640 in Egyptian Numeral | 𓍧𓎉 |
| 640 in Babylonian Numeral |   |
Roots and stuff for 640
| Is 640 a square number? | 640 is NOT a square number |
| Is 640 a cube number? | 640 is NOT a cube number |
| Square root of the number 640 | 25.298221281347 |
| Cube root of the number 640 | 8.6177387601275 |
Recreational math for 640
| Number 640 reversed | 046 |
| Sum of the digits | 10 |
| No of digits | 3 |