640
Everything about the number 640 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 640
| Nominal | 640 |
| Cardinal | six hundred forty |
| Ordinal | 640th |
| This number as US currency | six hundred forty dollars |
Properties (and some facts) of 640
| 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 |
| Is 640 a triangle number? | 640 is not a triangle number |
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640 in other bases
| Base 2 (Binary) | 1010000000 |
| Base 3 (Ternary) | 212201 |
| Base 4 (Quaternary) | 22000 |
| Base 5 (Quinary) | 10030 |
| Base 6 (Senary) | 2544 |
| Base 8 (Octal) | 1200 |
| Base 12 (Duodecimal) | 454 |
| Base 16 (Hexadecimal) | 280 |
| Base 20 (Vigesimal) | 1C0 |
Primes and factors tests for 640
| Is 640 a prime number? | 640 is not a prime number |
| 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 |
640 in other numeral systems
| 640 in Roman numerals | DCXL |
| 640 in Chinese numerals | 陸佰肆拾 |
| 640 in Babylonian numerals |   |
| 640 in Egyptian numerals | 𓍧𓎉 |
Roots and squares 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 640 | 25.298221281347 |
| Cube root of 640 | 8.6177387601275 |
Recreational math for 640
| Number 640 reversed | 046 |
| Sum of the digits | 10 |
| Number of digits | 3 |
Arithmetic tables for 640
Other pages about 640
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