72128012928 has 64 divisors (see below), whose sum is σ = 191639517600. Its totient is φ = 24036461568.

The previous prime is 72128012927. The next prime is 72128012941. The reversal of 72128012928 is 82921082127.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 72128012928.

It is not an unprimeable number, because it can be changed into a prime (72128012927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1607178 + ... + 1651446.

Almost surely, 2^72128012928 is an apocalyptic number.

It is an amenable number.

72128012928 is an abundant number, since it is smaller than the sum of its proper divisors (119511504672).

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

72128012928 is a wasteful number, since it uses less digits than its factorization.

72128012928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48529 (or 48517 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The spelling of 72128012928 in words is "seventy-two billion, one hundred twenty-eight million, twelve thousand, nine hundred twenty-eight".