57320031 has 4 divisors (see below), whose sum is σ = 76426712. Its totient is φ = 38213352.

The previous prime is 57320027. The next prime is 57320033. The reversal of 57320031 is 13002375.

It is a happy number.

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

It is not a de Polignac number, because 57320031 - 2² = 57320027 is a prime.

It is a super-2 number, since 2×57320031² = 6571171907681922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57320033) 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, 9553336 + ... + 9553341.

It is an arithmetic number, because the mean of its divisors is an integer number (19106678).

Almost surely, 2^57320031 is an apocalyptic number.

57320031 is a deficient number, since it is larger than the sum of its proper divisors (19106681).

57320031 is a wasteful number, since it uses less digits than its factorization.

57320031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19106680.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 57320031 is about 7570.9993395852. Note that the first 3 decimals coincide. The cubic root of 57320031 is about 385.5690264509.

The spelling of 57320031 in words is "fifty-seven million, three hundred twenty thousand, thirty-one".