87213664 has 24 divisors (see below), whose sum is σ = 177242688. Its totient is φ = 42199680.

The previous prime is 87213647. The next prime is 87213691. The reversal of 87213664 is 46631278.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42967 + ... + 44950.

It is an arithmetic number, because the mean of its divisors is an integer number (7385112).

Almost surely, 2^87213664 is an apocalyptic number.

It is an amenable number.

87213664 is an abundant number, since it is smaller than the sum of its proper divisors (90029024).

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

87213664 is a wasteful number, since it uses less digits than its factorization.

87213664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87958 (or 87950 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 87213664 is about 9338.8256221005. The cubic root of 87213664 is about 443.4672071375.

The spelling of 87213664 in words is "eighty-seven million, two hundred thirteen thousand, six hundred sixty-four".