Compare 1280 vs 1285
| Property | 1280 | 1285 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 9 | 2 |
| Prime factorization | 28 × 51 | 51 × 2571 |
| Prime factorization | 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 | 5 × 257 |
| Divisors count | 18 | 4 |
| Divisors | 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280 | 1, 5, 257, 1285 |
| Number of properties | 0 | 1 |
| Semiprimes | 378th | |
| Roman numberals | MCCLXXX | MCCLXXXV |
| Base 2 | 101000000002 | 101000001012 |
| Base 3 | 12021023 | 12021213 |
| Base 4 | 1100004 | 1100114 |
| Base 5 | 201105 | 201205 |
| Base 6 | 55326 | 55416 |
| Base 7 | 35067 | 35147 |
| Base 8 | 24008 | 24058 |
| Base 9 | 16729 | 16779 |
| Base 10 | 128010 | 128510 |
| Base 11 | a6411 | a6911 |
| Base 12 | 8a812 | 8b112 |
| Base 13 | 77613 | 77b13 |
| Base 14 | 67614 | 67b14 |
| Base 15 | 5a515 | 5aa15 |
| Base 16 | 50016 | 50516 |