Factors / Factors of 89

Factors of 89

1, 89

89 is prime: only factor pair is (1, 89), confirmed by trial division up to √89 ≈ 9.4 turning up nothing else. 89's full pair list is (1, 89), for 2 divisors in total. 89's divisors other than 89 itself sum to just 1, 88 below 89: the common deficient case. 89 is odd, digit sum 17 for 89; none of 2-12 divide 89 evenly. 89 has 2 divisors; 88 has 8 and 90 has 12, so 90 wins here. 89 divided by its largest divisor, 1, gives 89.