86931520 has 56 divisors (see below), whose sum is σ = 222939864. Its totient is φ = 32096256.

The previous prime is 86931503. The next prime is 86931553. The reversal of 86931520 is 2513968.

It can be written as a sum of positive squares in 4 ways, for example, as 2585664 + 84345856 = 1608^2 + 9184^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6289 + ... + 14608.

It is an arithmetic number, because the mean of its divisors is an integer number (3981069).

Almost surely, 2^86931520 is an apocalyptic number.

86931520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

86931520 is an abundant number, since it is smaller than the sum of its proper divisors (136008344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

86931520 is a wasteful number, since it uses less digits than its factorization.

86931520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20927 (or 20917 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 86931520 is about 9323.7074171169. The cubic root of 86931520 is about 442.9884718281.

The spelling of 86931520 in words is "eighty-six million, nine hundred thirty-one thousand, five hundred twenty".