Compare 28 vs 53
| Property | 28 | 53 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 2 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 22 × 71 | 531 |
| Prime factorization | 2 × 2 × 7 | 53 |
| Divisors count | 6 | 2 |
| Divisors | 1, 2, 4, 7, 14, 28 | 1, 53 |
| Number of properties | 0 | 18 |
| Chen primes | 15th | |
| Class 1+ primes | 10th | |
| Good primes | 7th | |
| Isolated primes | 5th | |
| Left-truncatable primes | 11th | |
| Pierpont primes of the 2nd kind | 10th | |
| Primes | 16th | |
| Pythagorean primes | 7th | |
| Restricted right-truncatable primes | 1st | |
| Right-truncatable primes | 9th | |
| Sexy primes (1st member) | 11th | |
| Sexy primes (2nd member) | 10th | |
| Sexy prime quadrupletss (3rd member) | 3rd | |
| Sexy prime triplets (2nd member) | 7th | |
| Sexy prime triplets (3rd member) | 6th | |
| Sophie germain primes | 8th | |
| Two-sided primes | 7th | |
| Ulam primes | 6th | |
| Roman numberals | XXVIII | LIII |
| Base 2 | 111002 | 1101012 |
| Base 3 | 10013 | 12223 |
| Base 4 | 1304 | 3114 |
| Base 5 | 1035 | 2035 |
| Base 6 | 446 | 1256 |
| Base 7 | 407 | 1047 |
| Base 8 | 348 | 658 |
| Base 9 | 319 | 589 |
| Base 10 | 2810 | 5310 |
| Base 11 | 2611 | 4911 |
| Base 12 | 2412 | 4512 |
| Base 13 | 2213 | 4113 |
| Base 14 | 2014 | 3b14 |
| Base 15 | 1d15 | 3815 |
| Base 16 | 1c16 | 3516 |