Factors / Factors of 28

Factors of 28

1, 2, 4, 7, 14, 28

28 breaks into 3 pairs, tested up to √28 ≈ 5.3; each pair multiplies back to 28 exactly. 28's full pair list is (1, 28), (2, 14), (4, 7), for 6 divisors in total. 28's divisors other than 28 itself sum to exactly 28, the mark of a perfect number. 28 is even, digit sum 10 for 28; small divisors of 28 include 2, 4, 7. 28 has 6 divisors; 27 has 4 and 29 has 2, so 28 wins here. 28 divided by its largest divisor, 14, gives 2.