57221478 has 40 divisors (see below), whose sum is σ = 128676240. Its totient is φ = 19005840.

The previous prime is 57221441. The next prime is 57221533. The reversal of 57221478 is 87412275.

57221478 is a `hidden beast` number, since 572 + 2 + 14 + 78 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 67783 + ... + 68621.

It is an arithmetic number, because the mean of its divisors is an integer number (3216906).

Almost surely, 2^57221478 is an apocalyptic number.

57221478 is an abundant number, since it is smaller than the sum of its proper divisors (71454762).

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

57221478 is a wasteful number, since it uses less digits than its factorization.

57221478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274 (or 1265 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 57221478 is about 7564.4879535895. The cubic root of 57221478 is about 385.3479240879.

The spelling of 57221478 in words is "fifty-seven million, two hundred twenty-one thousand, four hundred seventy-eight".