57656520 has 96 divisors (see below), whose sum is σ = 198427320. Its totient is φ = 14469120.

The previous prime is 57656519. The next prime is 57656551. The reversal of 57656520 is 2565675.

57656520 is a `hidden beast` number, since 5 + 76 + 565 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 48692484 + 8964036 = 6978^2 + 2994^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1410 + ... + 10830.

Almost surely, 2^57656520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57656520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99213660).

57656520 is an abundant number, since it is smaller than the sum of its proper divisors (140770800).

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

57656520 is a wasteful number, since it uses less digits than its factorization.

57656520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9455 (or 9448 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 57656520 is about 7593.1890533556. The cubic root of 57656520 is about 386.3220307427.

The spelling of 57656520 in words is "fifty-seven million, six hundred fifty-six thousand, five hundred twenty".