128023728 has 80 divisors (see below), whose sum is σ = 386808576. Its totient is φ = 35723520.

The previous prime is 128023697. The next prime is 128023733. The reversal of 128023728 is 827320821.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10018 + ... + 18878.

Almost surely, 2^128023728 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 128023728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193404288).

128023728 is an abundant number, since it is smaller than the sum of its proper divisors (258784848).

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

128023728 is a wasteful number, since it uses less digits than its factorization.

128023728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8922 (or 8916 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 128023728 is about 11314.7570897479. The cubic root of 128023728 is about 503.9995590825. Note that the first 3 decimals are identical.

The spelling of 128023728 in words is "one hundred twenty-eight million, twenty-three thousand, seven hundred twenty-eight".