87365631 has 4 divisors (see below), whose sum is σ = 116487512. Its totient is φ = 58243752.

The previous prime is 87365627. The next prime is 87365639. The reversal of 87365631 is 13656378.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 87365631 - 2² = 87365627 is a prime.

It is a super-2 number, since 2×87365631² = 15265506960056322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87365631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87365639) 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, 14560936 + ... + 14560941.

It is an arithmetic number, because the mean of its divisors is an integer number (29121878).

Almost surely, 2^87365631 is an apocalyptic number.

87365631 is a deficient number, since it is larger than the sum of its proper divisors (29121881).

87365631 is a wasteful number, since it uses less digits than its factorization.

87365631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29121880.

The product of its digits is 90720, while the sum is 39.

The square root of 87365631 is about 9346.9583822760. The cubic root of 87365631 is about 443.7246334505.

The spelling of 87365631 in words is "eighty-seven million, three hundred sixty-five thousand, six hundred thirty-one".