56220640 has 144 divisors (see below), whose sum is σ = 158233824. Its totient is φ = 18816000.

The previous prime is 56220623. The next prime is 56220643. The reversal of 56220640 is 4602265.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56220643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 556590 + ... + 556690.

It is an arithmetic number, because the mean of its divisors is an integer number (1098846).

Almost surely, 2^56220640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56220640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79116912).

56220640 is an abundant number, since it is smaller than the sum of its proper divisors (102013184).

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

56220640 is a wasteful number, since it uses less digits than its factorization.

56220640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 56220640 is about 7498.0424111897. The cubic root of 56220640 is about 383.0880413507.

The spelling of 56220640 in words is "fifty-six million, two hundred twenty thousand, six hundred forty".