87511988 has 12 divisors (see below), whose sum is σ = 162154692. Its totient is φ = 41182080.

The previous prime is 87511981. The next prime is 87511997. The reversal of 87511988 is 88911578.

It can be written as a sum of positive squares in 2 ways, for example, as 75829264 + 11682724 = 8708^2 + 3418^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87511981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643403 + ... + 643538.

It is an arithmetic number, because the mean of its divisors is an integer number (13512891).

Almost surely, 2^87511988 is an apocalyptic number.

It is an amenable number.

87511988 is a deficient number, since it is larger than the sum of its proper divisors (74642704).

87511988 is a wasteful number, since it uses less digits than its factorization.

87511988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286962 (or 1286960 counting only the distinct ones).

The product of its digits is 161280, while the sum is 47.

The square root of 87511988 is about 9354.7842305421. The cubic root of 87511988 is about 443.9722745991.

The spelling of 87511988 in words is "eighty-seven million, five hundred eleven thousand, nine hundred eighty-eight".