87186631 has 12 divisors (see below), whose sum is σ = 102938808. Its totient is φ = 73613232.

The previous prime is 87186613. The next prime is 87186661. The reversal of 87186631 is 13668178.

It is not a de Polignac number, because 87186631 - 2⁵ = 87186599 is a prime.

It is a super-2 number, since 2×87186631² = 15203017250260322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87186661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9996 + ... + 16561.

It is an arithmetic number, because the mean of its divisors is an integer number (8578234).

Almost surely, 2^87186631 is an apocalyptic number.

87186631 is a deficient number, since it is larger than the sum of its proper divisors (15752177).

87186631 is a wasteful number, since it uses less digits than its factorization.

87186631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26638 (or 26631 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 87186631 is about 9337.3781652025. The cubic root of 87186631 is about 443.4213829424.

The spelling of 87186631 in words is "eighty-seven million, one hundred eighty-six thousand, six hundred thirty-one".