Compare 640 vs 651
| Property | 640 | 651 |
|---|---|---|
| Type | composite number | composite number |
| Unique factors | 2 | 3 |
| Total factors | 8 | 3 |
| Prime factorization | 27 × 51 | 31 × 71 × 311 |
| Prime factorization | 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 | 3 × 7 × 31 |
| Divisors count | 16 | 8 |
| Divisors | 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640 | 1, 3, 7, 21, 31, 93, 217, 651 |
| Number of properties | 0 | 0 |
| Roman numberals | DCXL | DCLI |
| Base 2 | 10100000002 | 10100010112 |
| Base 3 | 2122013 | 2200103 |
| Base 4 | 220004 | 220234 |
| Base 5 | 100305 | 101015 |
| Base 6 | 25446 | 30036 |
| Base 7 | 16037 | 16207 |
| Base 8 | 12008 | 12138 |
| Base 9 | 7819 | 8039 |
| Base 10 | 64010 | 65110 |
| Base 11 | 53211 | 54211 |
| Base 12 | 45412 | 46312 |
| Base 13 | 3a313 | 3b113 |
| Base 14 | 33a14 | 34714 |
| Base 15 | 2ca15 | 2d615 |
| Base 16 | 28016 | 28b16 |