Compare 9 vs 28
| Property | 9 | 28 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 1 | 2 |
| Total factors | 2 | 3 |
| Prime factorization | 32 | 22 × 71 |
| Prime factorization | 3 × 3 | 2 × 2 × 7 |
| Divisors count | 3 | 6 |
| Divisors | 1, 3, 9 | 1, 2, 4, 7, 14, 28 |
| Number of properties | 1 | 0 |
| Semiprimes | 3rd | |
| Roman numberals | IX | XXVIII |
| Base 2 | 10012 | 111002 |
| Base 3 | 1003 | 10013 |
| Base 4 | 214 | 1304 |
| Base 5 | 145 | 1035 |
| Base 6 | 136 | 446 |
| Base 7 | 127 | 407 |
| Base 8 | 118 | 348 |
| Base 9 | 109 | 319 |
| Base 10 | 910 | 2810 |
| Base 11 | 911 | 2611 |
| Base 12 | 912 | 2412 |
| Base 13 | 913 | 2213 |
| Base 14 | 914 | 2014 |
| Base 15 | 915 | 1d15 |
| Base 16 | 916 | 1c16 |