even, composite, triangular · 28th positive integer
The number 28
28 is an even composite number. It is the 28th positive integer.
Quick reference
| Prime factorization | 2 × 2 × 7 |
| Divisors | 1, 2, 4, 7, 14, 28 |
| Binary | 11100 |
| Hexadecimal | 0x1C |
| Roman numeral | XXVIII |
| Digit sum | 10 |
| Properties | even, composite, triangular |
Frequently asked
Is 28 a prime number?
No. 28 is composite. Its prime factorization is 2 × 2 × 7.
What are the factors of 28?
The factors (divisors) of 28 are 1, 2, 4, 7, 14, 28.
What is 28 in binary?
28 in binary is 11100. In hexadecimal it's 1C.
What is 28 as a Roman numeral?
28 in Roman numerals is XXVIII.
What's the digit sum of 28?
Adding the digits of 28: 2 + 8 = 10.