even, composite · 640th positive integer
The number 640
640 is an even composite number. It is the 640th positive integer.
Quick reference
| Prime factorization | 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 |
| Divisors | 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640 |
| Binary | 1010000000 |
| Hexadecimal | 0x280 |
| Roman numeral | DCXL |
| Digit sum | 10 |
| Properties | even, composite |
Frequently asked
Is 640 a prime number?
No. 640 is composite. Its prime factorization is 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5.
What are the factors of 640?
The factors (divisors) of 640 are 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640.
What is 640 in binary?
640 in binary is 1010000000. In hexadecimal it's 280.
What is 640 as a Roman numeral?
640 in Roman numerals is DCXL.
What's the digit sum of 640?
Adding the digits of 640: 6 + 4 + 0 = 10.