87431817 has 12 divisors (see below), whose sum is σ = 128137520. Its totient is φ = 52988760.

The previous prime is 87431807. The next prime is 87431819. The reversal of 87431817 is 71813478.

It is not a de Polignac number, because 87431817 - 2⁴ = 87431801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87431819) 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, 120067 + ... + 120792.

Almost surely, 2^87431817 is an apocalyptic number.

It is an amenable number.

87431817 is a deficient number, since it is larger than the sum of its proper divisors (40705703).

87431817 is a wasteful number, since it uses less digits than its factorization.

87431817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240884 (or 240873 counting only the distinct ones).

The product of its digits is 37632, while the sum is 39.

The square root of 87431817 is about 9350.4982220200. The cubic root of 87431817 is about 443.8366566993.

The spelling of 87431817 in words is "eighty-seven million, four hundred thirty-one thousand, eight hundred seventeen".