87215664 has 40 divisors (see below), whose sum is σ = 225660160. Its totient is φ = 29026368.

The previous prime is 87215657. The next prime is 87215677. The reversal of 87215664 is 46651278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45477 + ... + 47355.

It is an arithmetic number, because the mean of its divisors is an integer number (5641504).

Almost surely, 2^87215664 is an apocalyptic number.

It is an amenable number.

87215664 is an abundant number, since it is smaller than the sum of its proper divisors (138444496).

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

87215664 is a wasteful number, since it uses less digits than its factorization.

87215664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857 (or 2851 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 87215664 is about 9338.9327013316. The cubic root of 87215664 is about 443.4705970024.

The spelling of 87215664 in words is "eighty-seven million, two hundred fifteen thousand, six hundred sixty-four".