Numbers / 987

The Number 987

987 is composite: factorization 3 × 7 × 47. That gives 987 exactly 8 divisors: 1, 3, 7, 21, 47, 141, 329, 987. 987's proper divisors total just 549, 438 short of 987, the deficient case most of 987's neighbors share too. 987 is also a Fibonacci number, since 610 + 377 = 987. 987 has a digit sum of 24; for 987, the digital root works out to 6. 987: 3, 7 all divide 987 evenly, out of 2-12. 987 is 1111011011 in binary and 3DB in hex; as a Roman numeral it's CMLXXXVII.