87564931 has 4 divisors (see below), whose sum is σ = 87620832. Its totient is φ = 87509032.

The previous prime is 87564923. The next prime is 87564941. The reversal of 87564931 is 13946578.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13946578 = 2 ⋅6973289.

It is a cyclic number.

It is not a de Polignac number, because 87564931 - 2³ = 87564923 is a prime.

It is a super-2 number, since 2×87564931² = 15335234282069522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87564941) 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, 25531 + ... + 28756.

It is an arithmetic number, because the mean of its divisors is an integer number (21905208).

Almost surely, 2^87564931 is an apocalyptic number.

87564931 is a deficient number, since it is larger than the sum of its proper divisors (55901).

87564931 is a wasteful number, since it uses less digits than its factorization.

87564931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55900.

The product of its digits is 181440, while the sum is 43.

The square root of 87564931 is about 9357.6135312375. The cubic root of 87564931 is about 444.0617879949.

The spelling of 87564931 in words is "eighty-seven million, five hundred sixty-four thousand, nine hundred thirty-one".