57164781 has 4 divisors (see below), whose sum is σ = 76219712. Its totient is φ = 38109852.

The previous prime is 57164773. The next prime is 57164791. The reversal of 57164781 is 18746175.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 57164781 - 2³ = 57164773 is a prime.

It is a super-2 number, since 2×57164781² = 6535624373555922, 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 (57164791) 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, 9527461 + ... + 9527466.

It is an arithmetic number, because the mean of its divisors is an integer number (19054928).

Almost surely, 2^57164781 is an apocalyptic number.

It is an amenable number.

57164781 is a deficient number, since it is larger than the sum of its proper divisors (19054931).

57164781 is a wasteful number, since it uses less digits than its factorization.

57164781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19054930.

The product of its digits is 47040, while the sum is 39.

The square root of 57164781 is about 7560.7394479641. The cubic root of 57164781 is about 385.2206100563.

The spelling of 57164781 in words is "fifty-seven million, one hundred sixty-four thousand, seven hundred eighty-one".