Compare 28 vs 47
| Property | 28 | 47 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 2 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 22 × 71 | 471 |
| Prime factorization | 2 × 2 × 7 | 47 |
| Divisors count | 6 | 2 |
| Divisors | 1, 2, 4, 7, 14, 28 | 1, 47 |
| Number of properties | 0 | 21 |
| Additive primes | 10th | |
| Carol primes | 2nd | |
| Chen primes | 14th | |
| Class 1+ primes | 9th | |
| Cousin primes (2nd member) | 6th | |
| Isolated primes | 4th | |
| Left-truncatable primes | 10th | |
| Long primes | 6th | |
| Lucas primes | 6th | |
| Pierpont primes of the 2nd kind | 9th | |
| Primes | 15th | |
| Prime triplets (3rd member) | 7th | |
| Safe primes | 5th | |
| Sexy primes (1st member) | 10th | |
| Sexy primes (2nd member) | 9th | |
| Sexy prime quadrupletss (2nd member) | 3rd | |
| Sexy prime triplets (1st member) | 7th | |
| Sexy prime triplets (2nd member) | 6th | |
| Solinas primes | 13th | |
| Thabit primes | 5th | |
| Ulam primes | 5th | |
| Roman numberals | XXVIII | XLVII |
| Base 2 | 111002 | 1011112 |
| Base 3 | 10013 | 12023 |
| Base 4 | 1304 | 2334 |
| Base 5 | 1035 | 1425 |
| Base 6 | 446 | 1156 |
| Base 7 | 407 | 657 |
| Base 8 | 348 | 578 |
| Base 9 | 319 | 529 |
| Base 10 | 2810 | 4710 |
| Base 11 | 2611 | 4311 |
| Base 12 | 2412 | 3b12 |
| Base 13 | 2213 | 3813 |
| Base 14 | 2014 | 3514 |
| Base 15 | 1d15 | 3215 |
| Base 16 | 1c16 | 2f16 |