Compare 644 vs 655
| Property | 644 | 655 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 3 | 2 |
| Total factors | 4 | 2 |
| Prime factorization | 22 × 71 × 231 | 51 × 1311 |
| Prime factorization | 2 × 2 × 7 × 23 | 5 × 131 |
| Divisors count | 12 | 4 |
| Divisors | 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322, 644 | 1, 5, 131, 655 |
| Number of properties | 0 | 1 |
| Semiprimes | 197th | |
| Roman numberals | DCXLIV | DCLV |
| Base 2 | 10100001002 | 10100011112 |
| Base 3 | 2122123 | 2200213 |
| Base 4 | 220104 | 220334 |
| Base 5 | 100345 | 101105 |
| Base 6 | 25526 | 30116 |
| Base 7 | 16107 | 16247 |
| Base 8 | 12048 | 12178 |
| Base 9 | 7859 | 8079 |
| Base 10 | 64410 | 65510 |
| Base 11 | 53611 | 54611 |
| Base 12 | 45812 | 46712 |
| Base 13 | 3a713 | 3b513 |
| Base 14 | 34014 | 34b14 |
| Base 15 | 2ce15 | 2da15 |
| Base 16 | 28416 | 28f16 |