56809720 has 32 divisors (see below), whose sum is σ = 139443120. Its totient is φ = 20657920.

The previous prime is 56809667. The next prime is 56809721. The reversal of 56809720 is 2790865.

It is a self number, because there is not a number n which added to its sum of digits gives 56809720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56809721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64117 + ... + 64996.

Almost surely, 2^56809720 is an apocalyptic number.

It is an amenable number.

56809720 is an abundant number, since it is smaller than the sum of its proper divisors (82633400).

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

56809720 is a wasteful number, since it uses less digits than its factorization.

56809720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129135 (or 129131 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 56809720 is about 7537.2223000254. Note that the first 3 decimals coincide. The cubic root of 56809720 is about 384.4213943162.

It can be divided in two parts, 5680 and 9720, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 56809720 in words is "fifty-six million, eight hundred nine thousand, seven hundred twenty".