87988 has 6 divisors (see below), whose sum is σ = 153986. Its totient is φ = 43992.

The previous prime is 87977. The next prime is 87991. The reversal of 87988 is 88978.

It can be written as a sum of positive squares in only one way, i.e., 79524 + 8464 = 282^2 + 92^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 87988.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10995 + ... + 11002.

2⁸⁷⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

87988 is a deficient number, since it is larger than the sum of its proper divisors (65998).

87988 is a wasteful number, since it uses less digits than its factorization.

87988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22001 (or 21999 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 87988 is about 296.6277127984. The cubic root of 87988 is about 44.4775799194.

Subtracting 87988 from its reverse (88978), we obtain a triangular number (990 = T₄₄).

The spelling of 87988 in words is "eighty-seven thousand, nine hundred eighty-eight".