128928768 has 44 divisors (see below), whose sum is σ = 343650360. Its totient is φ = 42975232.

The previous prime is 128928743. The next prime is 128928773. The reversal of 128928768 is 867829821.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 128928768.

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, 17913 + ... + 24056.

Almost surely, 2^128928768 is an apocalyptic number.

It is an amenable number.

128928768 is an abundant number, since it is smaller than the sum of its proper divisors (214721592).

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

128928768 is an equidigital number, since it uses as much as digits as its factorization.

128928768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41992 (or 41974 counting only the distinct ones).

The product of its digits is 774144, while the sum is 51.

The square root of 128928768 is about 11354.6804446448. The cubic root of 128928768 is about 505.1844152144.

The spelling of 128928768 in words is "one hundred twenty-eight million, nine hundred twenty-eight thousand, seven hundred sixty-eight".