87291984 has 40 divisors (see below), whose sum is σ = 242852512. Its totient is φ = 26858880.

The previous prime is 87291979. The next prime is 87292031. The reversal of 87291984 is 48919278.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69322 + ... + 70569.

Almost surely, 2^87291984 is an apocalyptic number.

It is an amenable number.

87291984 is an abundant number, since it is smaller than the sum of its proper divisors (155560528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87291984 is a wasteful number, since it uses less digits than its factorization.

87291984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139915 (or 139909 counting only the distinct ones).

The product of its digits is 290304, while the sum is 48.

The square root of 87291984 is about 9343.0179278432. The cubic root of 87291984 is about 443.5999155474.

The spelling of 87291984 in words is "eighty-seven million, two hundred ninety-one thousand, nine hundred eighty-four".