56720556 has 72 divisors (see below), whose sum is σ = 149108960. Its totient is φ = 18164736.

The previous prime is 56720537. The next prime is 56720557. The reversal of 56720556 is 65502765.

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

It is a self number, because there is not a number n which added to its sum of digits gives 56720556.

It is not an unprimeable number, because it can be changed into a prime (56720557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128985 + ... + 129423.

Almost surely, 2^56720556 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 56720556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74554480).

56720556 is an abundant number, since it is smaller than the sum of its proper divisors (92388404).

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

56720556 is a wasteful number, since it uses less digits than its factorization.

56720556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 578 counting only the distinct ones).

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

The square root of 56720556 is about 7531.3050661887. The cubic root of 56720556 is about 384.2201699633.

The spelling of 56720556 in words is "fifty-six million, seven hundred twenty thousand, five hundred fifty-six".