55831920728 has 32 divisors (see below), whose sum is σ = 105886569600. Its totient is φ = 27595653888.

The previous prime is 55831920707. The next prime is 55831920773. The reversal of 55831920728 is 82702913855.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4388825 + ... + 4401527.

It is an arithmetic number, because the mean of its divisors is an integer number (3308955300).

Almost surely, 2^55831920728 is an apocalyptic number.

It is an amenable number.

55831920728 is a deficient number, since it is larger than the sum of its proper divisors (50054648872).

55831920728 is a wasteful number, since it uses less digits than its factorization.

55831920728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18971 (or 18967 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 55831920728 in words is "fifty-five billion, eight hundred thirty-one million, nine hundred twenty thousand, seven hundred twenty-eight".