57239920 has 20 divisors (see below), whose sum is σ = 133083000. Its totient is φ = 22895936.

The previous prime is 57239911. The next prime is 57239921. The reversal of 57239920 is 2993275.

57239920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 57239920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57239921) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 357670 + ... + 357829.

It is an arithmetic number, because the mean of its divisors is an integer number (6654150).

Almost surely, 2^57239920 is an apocalyptic number.

It is an amenable number.

57239920 is an abundant number, since it is smaller than the sum of its proper divisors (75843080).

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

57239920 is a wasteful number, since it uses less digits than its factorization.

57239920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715512 (or 715506 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 57239920 is about 7565.7068407387. The cubic root of 57239920 is about 385.3893177704.

The spelling of 57239920 in words is "fifty-seven million, two hundred thirty-nine thousand, nine hundred twenty".