Compare 720 vs 721
| Property | 720 | 721 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 3 | 2 |
| Total factors | 7 | 2 |
| Prime factorization | 24 × 32 × 51 | 71 × 1031 |
| Prime factorization | 2 × 2 × 2 × 2 × 3 × 3 × 5 | 7 × 103 |
| Divisors count | 30 | 4 |
| Divisors | 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720 | 1, 7, 103, 721 |
| Number of properties | 0 | 1 |
| Semiprimes | 219th | |
| Roman numberals | DCCXX | DCCXXI |
| Base 2 | 10110100002 | 10110100012 |
| Base 3 | 2222003 | 2222013 |
| Base 4 | 231004 | 231014 |
| Base 5 | 103405 | 103415 |
| Base 6 | 32006 | 32016 |
| Base 7 | 20467 | 20507 |
| Base 8 | 13208 | 13218 |
| Base 9 | 8809 | 8819 |
| Base 10 | 72010 | 72110 |
| Base 11 | 5a511 | 5a611 |
| Base 12 | 50012 | 50112 |
| Base 13 | 43513 | 43613 |
| Base 14 | 39614 | 39714 |
| Base 15 | 33015 | 33115 |
| Base 16 | 2d016 | 2d116 |