57664521 has 8 divisors (see below), whose sum is σ = 85428960. Its totient is φ = 38442996.

The previous prime is 57664517. The next prime is 57664531. The reversal of 57664521 is 12546675.

It is a happy number.

57664521 is a `hidden beast` number, since 5 + 7 + 6 + 645 + 2 + 1 = 666.

It is not a de Polignac number, because 57664521 - 2² = 57664517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57664511) 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, 1067835 + ... + 1067888.

It is an arithmetic number, because the mean of its divisors is an integer number (10678620).

Almost surely, 2^57664521 is an apocalyptic number.

It is an amenable number.

57664521 is a deficient number, since it is larger than the sum of its proper divisors (27764439).

57664521 is a wasteful number, since it uses less digits than its factorization.

57664521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135732 (or 2135726 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 57664521 is about 7593.7158888123. The cubic root of 57664521 is about 386.3398998961.

It can be divided in two parts, 57664 and 521, that added together give a palindrome (58185).

The spelling of 57664521 in words is "fifty-seven million, six hundred sixty-four thousand, five hundred twenty-one".