Compare 644 vs 649
| Property | 644 | 649 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 3 | 2 |
| Total factors | 4 | 2 |
| Prime factorization | 22 × 71 × 231 | 111 × 591 |
| Prime factorization | 2 × 2 × 7 × 23 | 11 × 59 |
| Divisors count | 12 | 4 |
| Divisors | 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322, 644 | 1, 11, 59, 649 |
| Number of properties | 0 | 1 |
| Semiprimes | 196th | |
| Roman numberals | DCXLIV | DCXLIX |
| Base 2 | 10100001002 | 10100010012 |
| Base 3 | 2122123 | 2200013 |
| Base 4 | 220104 | 220214 |
| Base 5 | 100345 | 100445 |
| Base 6 | 25526 | 30016 |
| Base 7 | 16107 | 16157 |
| Base 8 | 12048 | 12118 |
| Base 9 | 7859 | 8019 |
| Base 10 | 64410 | 64910 |
| Base 11 | 53611 | 54011 |
| Base 12 | 45812 | 46112 |
| Base 13 | 3a713 | 3ac13 |
| Base 14 | 34014 | 34514 |
| Base 15 | 2ce15 | 2d415 |
| Base 16 | 28416 | 28916 |