57172356 has 18 divisors (see below), whose sum is σ = 144519102. Its totient is φ = 19057440.

The previous prime is 57172331. The next prime is 57172391. The reversal of 57172356 is 65327175.

It can be written as a sum of positive squares in only one way, i.e., 40525956 + 16646400 = 6366^2 + 4080^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1588121 = 57172356 / (5 + 7 + 1 + 7 + 2 + 3 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 57172356.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 794025 + ... + 794096.

It is an arithmetic number, because the mean of its divisors is an integer number (8028839).

Almost surely, 2^57172356 is an apocalyptic number.

It is an amenable number.

57172356 is an abundant number, since it is smaller than the sum of its proper divisors (87346746).

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

57172356 is a wasteful number, since it uses less digits than its factorization.

57172356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588131 (or 1588126 counting only the distinct ones).

The product of its digits is 44100, while the sum is 36.

The square root of 57172356 is about 7561.2403744359. The cubic root of 57172356 is about 385.2376247123.

It can be divided in two parts, 571 and 72356, that added together give a palindrome (72927).

The spelling of 57172356 in words is "fifty-seven million, one hundred seventy-two thousand, three hundred fifty-six".