56757720 has 64 divisors (see below), whose sum is σ = 171072000. Its totient is φ = 15064448.

The previous prime is 56757709. The next prime is 56757733. The reversal of 56757720 is 2775765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27691 + ... + 29669.

It is an arithmetic number, because the mean of its divisors is an integer number (2673000).

Almost surely, 2^56757720 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 56757720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85536000).

56757720 is an abundant number, since it is smaller than the sum of its proper divisors (114314280).

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

56757720 is a wasteful number, since it uses less digits than its factorization.

56757720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2232 (or 2228 counting only the distinct ones).

The product of its (nonzero) digits is 102900, while the sum is 39.

The square root of 56757720 is about 7533.7719636315. The cubic root of 56757720 is about 384.3040668896.

The spelling of 56757720 in words is "fifty-six million, seven hundred fifty-seven thousand, seven hundred twenty".