57978621 has 12 divisors (see below), whose sum is σ = 83855772. Its totient is φ = 38602176.

The previous prime is 57978617. The next prime is 57978629. The reversal of 57978621 is 12687975.

57978621 is a `hidden beast` number, since 579 + 78 + 6 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 54022500 + 3956121 = 7350^2 + 1989^2 .

It is not a de Polignac number, because 57978621 - 2² = 57978617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57978629) 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, 3955 + ... + 11471.

It is an arithmetic number, because the mean of its divisors is an integer number (6987981).

Almost surely, 2^57978621 is an apocalyptic number.

It is an amenable number.

57978621 is a deficient number, since it is larger than the sum of its proper divisors (25877151).

57978621 is a wasteful number, since it uses less digits than its factorization.

57978621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8380 (or 8377 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 57978621 is about 7614.3693763831. The cubic root of 57978621 is about 387.0400976020.

The spelling of 57978621 in words is "fifty-seven million, nine hundred seventy-eight thousand, six hundred twenty-one".