57639940 has 24 divisors (see below), whose sum is σ = 121282560. Its totient is φ = 23010528.

The previous prime is 57639929. The next prime is 57639941. The reversal of 57639940 is 4993675.

It is not an unprimeable number, because it can be changed into a prime (57639941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8701 + ... + 13819.

It is an arithmetic number, because the mean of its divisors is an integer number (5053440).

Almost surely, 2^57639940 is an apocalyptic number.

It is an amenable number.

57639940 is an abundant number, since it is smaller than the sum of its proper divisors (63642620).

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

57639940 is a wasteful number, since it uses less digits than its factorization.

57639940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5691 (or 5689 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 57639940 is about 7592.0972069646. The cubic root of 57639940 is about 386.2849962879.

The spelling of 57639940 in words is "fifty-seven million, six hundred thirty-nine thousand, nine hundred forty".