Compare 28 vs 37
| Property | 28 | 37 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 2 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 22 × 71 | 371 |
| Prime factorization | 2 × 2 × 7 | 37 |
| Divisors count | 6 | 2 |
| Divisors | 1, 2, 4, 7, 14, 28 | 1, 37 |
| Number of properties | 0 | 18 |
| Chen primes | 12th | |
| Cousin primes (1st member) | 5th | |
| Cuban primes 1 | 3rd | |
| Emirps | 4th | |
| Good primes | 5th | |
| Isolated primes | 3rd | |
| Left-truncatable primes | 8th | |
| Lucky primes | 5th | |
| Pierpont primes | 8th | |
| Primes | 12th | |
| Prime triplets (1st member) | 6th | |
| Pythagorean primes | 5th | |
| Right-truncatable primes | 8th | |
| Sexy primes (1st member) | 8th | |
| Sexy primes (2nd member) | 7th | |
| Sexy prime triplets (2nd member) | 5th | |
| Solinas primes | 11th | |
| Two-sided primes | 6th | |
| Roman numberals | XXVIII | XXXVII |
| Base 2 | 111002 | 1001012 |
| Base 3 | 10013 | 11013 |
| Base 4 | 1304 | 2114 |
| Base 5 | 1035 | 1225 |
| Base 6 | 446 | 1016 |
| Base 7 | 407 | 527 |
| Base 8 | 348 | 458 |
| Base 9 | 319 | 419 |
| Base 10 | 2810 | 3710 |
| Base 11 | 2611 | 3411 |
| Base 12 | 2412 | 3112 |
| Base 13 | 2213 | 2b13 |
| Base 14 | 2014 | 2914 |
| Base 15 | 1d15 | 2715 |
| Base 16 | 1c16 | 2516 |