56457731328 has 144 divisors (see below), whose sum is σ = 153993455616. Its totient is φ = 18353018880.

The previous prime is 56457731261. The next prime is 56457731329. The reversal of 56457731328 is 82313775465.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56457731329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36028401 + ... + 36029967.

Almost surely, 2^56457731328 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 56457731328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76996727808).

56457731328 is an abundant number, since it is smaller than the sum of its proper divisors (97535724288).

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

56457731328 is a wasteful number, since it uses less digits than its factorization.

56457731328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720 (or 2706 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 51.

The spelling of 56457731328 in words is "fifty-six billion, four hundred fifty-seven million, seven hundred thirty-one thousand, three hundred twenty-eight".