Compare 639 vs 640
| Property | 639 | 640 |
|---|---|---|
| Type | composite number | composite number |
| Unique factors | 2 | 2 |
| Total factors | 3 | 8 |
| Prime factorization | 32 × 711 | 27 × 51 |
| Prime factorization | 3 × 3 × 71 | 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 |
| Divisors count | 6 | 16 |
| Divisors | 1, 3, 9, 71, 213, 639 | 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640 |
| Number of properties | 0 | 0 |
| Roman numberals | DCXXXIX | DCXL |
| Base 2 | 10011111112 | 10100000002 |
| Base 3 | 2122003 | 2122013 |
| Base 4 | 213334 | 220004 |
| Base 5 | 100245 | 100305 |
| Base 6 | 25436 | 25446 |
| Base 7 | 16027 | 16037 |
| Base 8 | 11778 | 12008 |
| Base 9 | 7809 | 7819 |
| Base 10 | 63910 | 64010 |
| Base 11 | 53111 | 53211 |
| Base 12 | 45312 | 45412 |
| Base 13 | 3a213 | 3a313 |
| Base 14 | 33914 | 33a14 |
| Base 15 | 2c915 | 2ca15 |
| Base 16 | 27f16 | 28016 |