87905931 has 32 divisors (see below), whose sum is σ = 127733760. Its totient is φ = 53606784.

The previous prime is 87905921. The next prime is 87905947. The reversal of 87905931 is 13950978.

It is a happy number.

It is not a de Polignac number, because 87905931 - 2⁵ = 87905899 is a prime.

It is a super-2 number, since 2×87905931² = 15454905409953522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87905921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 394086 + ... + 394308.

It is an arithmetic number, because the mean of its divisors is an integer number (3991680).

Almost surely, 2^87905931 is an apocalyptic number.

87905931 is a deficient number, since it is larger than the sum of its proper divisors (39827829).

87905931 is a wasteful number, since it uses less digits than its factorization.

87905931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 87905931 is about 9375.8162844629. The cubic root of 87905931 is about 444.6374710133.

The spelling of 87905931 in words is "eighty-seven million, nine hundred five thousand, nine hundred thirty-one".