57365721 has 24 divisors (see below), whose sum is σ = 96636800. Its totient is φ = 32778648.

The previous prime is 57365647. The next prime is 57365723. The reversal of 57365721 is 12756375.

57365721 is a `hidden beast` number, since 57 + 36 + 572 + 1 = 666.

It is not a de Polignac number, because 57365721 - 2²³ = 48977113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57365723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6205 + ... + 12378.

Almost surely, 2^57365721 is an apocalyptic number.

It is an amenable number.

57365721 is a deficient number, since it is larger than the sum of its proper divisors (39271079).

57365721 is a wasteful number, since it uses less digits than its factorization.

57365721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18610 (or 18593 counting only the distinct ones).

The product of its digits is 44100, while the sum is 36.

The square root of 57365721 is about 7574.0161737350. The cubic root of 57365721 is about 385.6714453890.

The spelling of 57365721 in words is "fifty-seven million, three hundred sixty-five thousand, seven hundred twenty-one".