56721344 has 14 divisors (see below), whose sum is σ = 112556544. Its totient is φ = 28360640.

The previous prime is 56721331. The next prime is 56721359. The reversal of 56721344 is 44312765.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 56721344.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 443072 + ... + 443199.

Almost surely, 2^56721344 is an apocalyptic number.

It is an amenable number.

56721344 is a deficient number, since it is larger than the sum of its proper divisors (55835200).

56721344 is an equidigital number, since it uses as much as digits as its factorization.

56721344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886283 (or 886273 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 56721344 is about 7531.3573809772. The cubic root of 56721344 is about 384.2219492365.

The spelling of 56721344 in words is "fifty-six million, seven hundred twenty-one thousand, three hundred forty-four".