Numbers / 86

The Number 86

86 is composite: factorization 2 × 43. That gives 86 exactly 4 divisors: 1, 2, 43, 86. 86's proper divisors total just 46, 40 short of 86, the deficient case most of 86's neighbors share too. 86 has a digit sum of 14; for 86, the digital root works out to 5. 86: 2 all divide 86 evenly, out of 2-12. 86 is 1010110 in binary and 56 in hex; as a Roman numeral it's LXXXVI.