123478728832 has 32 divisors (see below), whose sum is σ = 256688124480. Its totient is φ = 59055042816.

The previous prime is 123478728811. The next prime is 123478728847. The reversal of 123478728832 is 238827874321.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20968308 + ... + 20974195.

It is an arithmetic number, because the mean of its divisors is an integer number (8021503890).

Almost surely, 2^123478728832 is an apocalyptic number.

It is an amenable number.

123478728832 is an abundant number, since it is smaller than the sum of its proper divisors (133209395648).

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

123478728832 is an equidigital number, since it uses as much as digits as its factorization.

123478728832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41942540 (or 41942528 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 55.

The spelling of 123478728832 in words is "one hundred twenty-three billion, four hundred seventy-eight million, seven hundred twenty-eight thousand, eight hundred thirty-two".