Compare 721 vs 728
| Property | 721 | 728 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 3 |
| Total factors | 2 | 5 |
| Prime factorization | 71 × 1031 | 23 × 71 × 131 |
| Prime factorization | 7 × 103 | 2 × 2 × 2 × 7 × 13 |
| Divisors count | 4 | 16 |
| Divisors | 1, 7, 103, 721 | 1, 2, 4, 7, 8, 13, 14, 26, 28, 52, 56, 91, 104, 182, 364, 728 |
| Number of properties | 1 | 0 |
| Semiprimes | 219th | |
| Roman numberals | DCCXXI | DCCXXVIII |
| Base 2 | 10110100012 | 10110110002 |
| Base 3 | 2222013 | 2222223 |
| Base 4 | 231014 | 231204 |
| Base 5 | 103415 | 104035 |
| Base 6 | 32016 | 32126 |
| Base 7 | 20507 | 20607 |
| Base 8 | 13218 | 13308 |
| Base 9 | 8819 | 8889 |
| Base 10 | 72110 | 72810 |
| Base 11 | 5a611 | 60211 |
| Base 12 | 50112 | 50812 |
| Base 13 | 43613 | 44013 |
| Base 14 | 39714 | 3a014 |
| Base 15 | 33115 | 33815 |
| Base 16 | 2d116 | 2d816 |