Compare 639 vs 645
| Property | 639 | 645 |
|---|---|---|
| Type | composite number | composite number |
| Unique factors | 2 | 3 |
| Total factors | 3 | 3 |
| Prime factorization | 32 × 711 | 31 × 51 × 431 |
| Prime factorization | 3 × 3 × 71 | 3 × 5 × 43 |
| Divisors count | 6 | 8 |
| Divisors | 1, 3, 9, 71, 213, 639 | 1, 3, 5, 15, 43, 129, 215, 645 |
| Number of properties | 0 | 0 |
| Roman numberals | DCXXXIX | DCXLV |
| Base 2 | 10011111112 | 10100001012 |
| Base 3 | 2122003 | 2122203 |
| Base 4 | 213334 | 220114 |
| Base 5 | 100245 | 100405 |
| Base 6 | 25436 | 25536 |
| Base 7 | 16027 | 16117 |
| Base 8 | 11778 | 12058 |
| Base 9 | 7809 | 7869 |
| Base 10 | 63910 | 64510 |
| Base 11 | 53111 | 53711 |
| Base 12 | 45312 | 45912 |
| Base 13 | 3a213 | 3a813 |
| Base 14 | 33914 | 34114 |
| Base 15 | 2c915 | 2d015 |
| Base 16 | 27f16 | 28516 |