56720 has 20 divisors (see below), whose sum is σ = 132060. Its totient is φ = 22656.

The previous prime is 56713. The next prime is 56731. The reversal of 56720 is 2765.

56720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13456 + 43264 = 116^2 + 208^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 56692 and 56701.

It is an unprimeable number.

56720 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275 + ... + 434.

It is an arithmetic number, because the mean of its divisors is an integer number (6603).

2⁵⁶⁷²⁰ is an apocalyptic number.

It is an amenable number.

56720 is an abundant number, since it is smaller than the sum of its proper divisors (75340).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66030).

56720 is a wasteful number, since it uses less digits than its factorization.

56720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 716 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 56720 is about 238.1596103457. The cubic root of 56720 is about 38.4218914527.

The spelling of 56720 in words is "fifty-six thousand, seven hundred twenty".