56621440 has 32 divisors (see below), whose sum is σ = 135362160. Its totient is φ = 22648320.

The previous prime is 56621431. The next prime is 56621443. The reversal of 56621440 is 4412665.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 56621399 and 56621408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56621443) 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, 43596 + ... + 44875.

Almost surely, 2^56621440 is an apocalyptic number.

It is an amenable number.

56621440 is an abundant number, since it is smaller than the sum of its proper divisors (78740720).

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

56621440 is an equidigital number, since it uses as much as digits as its factorization.

56621440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88490 (or 88478 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 56621440 is about 7524.7219217723. The cubic root of 56621440 is about 383.9962383891.

The spelling of 56621440 in words is "fifty-six million, six hundred twenty-one thousand, four hundred forty".