56639569728 has 224 divisors, whose sum is σ = 176653041664. Its totient is φ = 15679899648.

The previous prime is 56639569717. The next prime is 56639569751. The reversal of 56639569728 is 82796593665.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7335726 + ... + 7343442.

Almost surely, 2^56639569728 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 56639569728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88326520832).

56639569728 is an abundant number, since it is smaller than the sum of its proper divisors (120013471936).

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

56639569728 is a wasteful number, since it uses less digits than its factorization.

56639569728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7909 (or 7899 counting only the distinct ones).

The product of its digits is 146966400, while the sum is 66.

The spelling of 56639569728 in words is "fifty-six billion, six hundred thirty-nine million, five hundred sixty-nine thousand, seven hundred twenty-eight".