Compare 638 vs 640
| Property | 638 | 640 |
|---|---|---|
| Type | composite number | composite number |
| Unique factors | 3 | 2 |
| Total factors | 3 | 8 |
| Prime factorization | 21 × 111 × 291 | 27 × 51 |
| Prime factorization | 2 × 11 × 29 | 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 |
| Divisors count | 8 | 16 |
| Divisors | 1, 2, 11, 22, 29, 58, 319, 638 | 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640 |
| Number of properties | 0 | 0 |
| Roman numberals | DCXXXVIII | DCXL |
| Base 2 | 10011111102 | 10100000002 |
| Base 3 | 2121223 | 2122013 |
| Base 4 | 213324 | 220004 |
| Base 5 | 100235 | 100305 |
| Base 6 | 25426 | 25446 |
| Base 7 | 16017 | 16037 |
| Base 8 | 11768 | 12008 |
| Base 9 | 7789 | 7819 |
| Base 10 | 63810 | 64010 |
| Base 11 | 53011 | 53211 |
| Base 12 | 45212 | 45412 |
| Base 13 | 3a113 | 3a313 |
| Base 14 | 33814 | 33a14 |
| Base 15 | 2c815 | 2ca15 |
| Base 16 | 27e16 | 28016 |