57056820 has 24 divisors (see below), whose sum is σ = 159759264. Its totient is φ = 15215136.

The previous prime is 57056809. The next prime is 57056821. The reversal of 57056820 is 2865075.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57056821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475414 + ... + 475533.

It is an arithmetic number, because the mean of its divisors is an integer number (6656636).

Almost surely, 2^57056820 is an apocalyptic number.

It is an amenable number.

57056820 is an abundant number, since it is smaller than the sum of its proper divisors (102702444).

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

57056820 is a wasteful number, since it uses less digits than its factorization.

57056820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950959 (or 950957 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 57056820 is about 7553.5964943860. The cubic root of 57056820 is about 384.9779489254.

The spelling of 57056820 in words is "fifty-seven million, fifty-six thousand, eight hundred twenty".