87287931 has 6 divisors (see below), whose sum is σ = 126082580. Its totient is φ = 58191948.

The previous prime is 87287927. The next prime is 87287939. The reversal of 87287931 is 13978278.

It is not a de Polignac number, because 87287931 - 2² = 87287927 is a prime.

It is a super-2 number, since 2×87287931² = 15238365796521522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87287939) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4849321 + ... + 4849338.

Almost surely, 2^87287931 is an apocalyptic number.

87287931 is a deficient number, since it is larger than the sum of its proper divisors (38794649).

87287931 is a wasteful number, since it uses less digits than its factorization.

87287931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9698665 (or 9698662 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 87287931 is about 9342.8010253885. The cubic root of 87287931 is about 443.5930499369.

The spelling of 87287931 in words is "eighty-seven million, two hundred eighty-seven thousand, nine hundred thirty-one".