57172812 has 12 divisors (see below), whose sum is σ = 133403256. Its totient is φ = 19057600.

The previous prime is 57172811. The next prime is 57172813. The reversal of 57172812 is 21827175.

It is an interprime number because it is at equal distance from previous prime (57172811) and next prime (57172813).

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (57172811) 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, 2382189 + ... + 2382212.

It is an arithmetic number, because the mean of its divisors is an integer number (11116938).

Almost surely, 2^57172812 is an apocalyptic number.

It is an amenable number.

57172812 is an abundant number, since it is smaller than the sum of its proper divisors (76230444).

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

57172812 is a wasteful number, since it uses less digits than its factorization.

57172812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4764408 (or 4764406 counting only the distinct ones).

The product of its digits is 7840, while the sum is 33.

The square root of 57172812 is about 7561.2705281586. The cubic root of 57172812 is about 385.2386489129.

Adding to 57172812 its reverse (21827175), we get a palindrome (78999987).

The spelling of 57172812 in words is "fifty-seven million, one hundred seventy-two thousand, eight hundred twelve".