87172564 has 6 divisors (see below), whose sum is σ = 152551994. Its totient is φ = 43586280.

The previous prime is 87172543. The next prime is 87172571. The reversal of 87172564 is 46527178.

It can be written as a sum of positive squares in only one way, i.e., 56370064 + 30802500 = 7508^2 + 5550^2 .

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, 10896567 + ... + 10896574.

Almost surely, 2^87172564 is an apocalyptic number.

It is an amenable number.

87172564 is a deficient number, since it is larger than the sum of its proper divisors (65379430).

87172564 is a wasteful number, since it uses less digits than its factorization.

87172564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21793145 (or 21793143 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 87172564 is about 9336.6248719760. The cubic root of 87172564 is about 443.3975339340.

The spelling of 87172564 in words is "eighty-seven million, one hundred seventy-two thousand, five hundred sixty-four".