Compare 28 vs 51
| Property | 28 | 51 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 3 | 2 |
| Prime factorization | 22 × 71 | 31 × 171 |
| Prime factorization | 2 × 2 × 7 | 3 × 17 |
| Divisors count | 6 | 4 |
| Divisors | 1, 2, 4, 7, 14, 28 | 1, 3, 17, 51 |
| Number of properties | 0 | 1 |
| Semiprimes | 18th | |
| Roman numberals | XXVIII | LI |
| Base 2 | 111002 | 1100112 |
| Base 3 | 10013 | 12203 |
| Base 4 | 1304 | 3034 |
| Base 5 | 1035 | 2015 |
| Base 6 | 446 | 1236 |
| Base 7 | 407 | 1027 |
| Base 8 | 348 | 638 |
| Base 9 | 319 | 569 |
| Base 10 | 2810 | 5110 |
| Base 11 | 2611 | 4711 |
| Base 12 | 2412 | 4312 |
| Base 13 | 2213 | 3c13 |
| Base 14 | 2014 | 3914 |
| Base 15 | 1d15 | 3615 |
| Base 16 | 1c16 | 3316 |