57055640 has 32 divisors (see below), whose sum is σ = 133958880. Its totient is φ = 21829632.

The previous prime is 57055633. The next prime is 57055657. The reversal of 57055640 is 4655075.

It is a happy number.

57055640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 57055597 and 57055606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30089 + ... + 31928.

It is an arithmetic number, because the mean of its divisors is an integer number (4186215).

Almost surely, 2^57055640 is an apocalyptic number.

It is an amenable number.

57055640 is an abundant number, since it is smaller than the sum of its proper divisors (76903240).

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

57055640 is a wasteful number, since it uses less digits than its factorization.

57055640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62051 (or 62047 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 57055640 is about 7553.5183854943. The cubic root of 57055640 is about 384.9752949796.

The spelling of 57055640 in words is "fifty-seven million, fifty-five thousand, six hundred forty".