56571720 has 128 divisors (see below), whose sum is σ = 179712000. Its totient is φ = 14217984.

The previous prime is 56571679. The next prime is 56571727. The reversal of 56571720 is 2717565.

It is not an unprimeable number, because it can be changed into a prime (56571727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284181 + ... + 284379.

It is an arithmetic number, because the mean of its divisors is an integer number (1404000).

Almost surely, 2^56571720 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 56571720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89856000).

56571720 is an abundant number, since it is smaller than the sum of its proper divisors (123140280).

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

56571720 is a wasteful number, since it uses less digits than its factorization.

56571720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 56571720 is about 7521.4174196092. The cubic root of 56571720 is about 383.8838081619.

It can be divided in two parts, 56571 and 720, that added together give a triangular number (57291 = T₃₃₈).

The spelling of 56571720 in words is "fifty-six million, five hundred seventy-one thousand, seven hundred twenty".