Numbers / 27

The Number 27

27 is composite: factorization 3^3. That gives 27 exactly 4 divisors: 1, 3, 9, 27. 27's proper divisors total just 13, 14 short of 27, the deficient case most of 27's neighbors share too. 27 is also a perfect cube, since 3³ = 27. 27 has a digit sum of 9; for 27, the digital root works out to 9. 27: 3, 9 all divide 27 evenly, out of 2-12. 27 is 11011 in binary and 1B in hex; as a Roman numeral it's XXVII.