57768021 has 12 divisors (see below), whose sum is σ = 84857760. Its totient is φ = 37858920.

The previous prime is 57768017. The next prime is 57768043. The reversal of 57768021 is 12086775.

57768021 is a `hidden beast` number, since 577 + 6 + 80 + 2 + 1 = 666.

It is not a de Polignac number, because 57768021 - 2² = 57768017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57768071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53865 + ... + 54926.

It is an arithmetic number, because the mean of its divisors is an integer number (7071480).

Almost surely, 2^57768021 is an apocalyptic number.

It is an amenable number.

57768021 is a deficient number, since it is larger than the sum of its proper divisors (27089739).

57768021 is a wasteful number, since it uses less digits than its factorization.

57768021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108856 (or 108853 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 57768021 is about 7600.5276790497. The cubic root of 57768021 is about 386.5709043307.

The spelling of 57768021 in words is "fifty-seven million, seven hundred sixty-eight thousand, twenty-one".