56638720 has 36 divisors (see below), whose sum is σ = 135670500. Its totient is φ = 22654976.

The previous prime is 56638717. The next prime is 56638721. The reversal of 56638720 is 2783665.

It can be written as a sum of positive squares in 2 ways, for example, as 7750656 + 48888064 = 2784^2 + 6992^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 56638720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56638721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20845 + ... + 23404.

It is an arithmetic number, because the mean of its divisors is an integer number (3768625).

Almost surely, 2^56638720 is an apocalyptic number.

It is an amenable number.

56638720 is an abundant number, since it is smaller than the sum of its proper divisors (79031780).

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

56638720 is an equidigital number, since it uses as much as digits as its factorization.

56638720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44270 (or 44256 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 56638720 is about 7525.8700493697. The cubic root of 56638720 is about 384.0352976812.

The spelling of 56638720 in words is "fifty-six million, six hundred thirty-eight thousand, seven hundred twenty".