Numbers / 144

The Number 144

144 is composite: factorization 2^4 × 3^2. That gives 144 exactly 15 divisors: 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144. 144's proper divisors total 259, 115 more than 144 itself, so 144 is abundant. 144 also carries: a perfect square, since 12² = 144; and a Fibonacci number, since 89 + 55 = 144. 144 has a digit sum of 9; for 144, the digital root works out to 9. 144: 2, 3, 4, 6, 8, 9, 12 all divide 144 evenly, out of 2-12. 144 is 10010000 in binary and 90 in hex; as a Roman numeral it's CXLIV.