128938728 has 32 divisors (see below), whose sum is σ = 322940160. Its totient is φ = 42900480.

The previous prime is 128938723. The next prime is 128938729. The reversal of 128938728 is 827839821.

It is not an unprimeable number, because it can be changed into a prime (128938723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9193 + ... + 18503.

It is an arithmetic number, because the mean of its divisors is an integer number (10091880).

Almost surely, 2^128938728 is an apocalyptic number.

It is an amenable number.

128938728 is an abundant number, since it is smaller than the sum of its proper divisors (194001432).

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

128938728 is a wasteful number, since it uses less digits than its factorization.

128938728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9897 (or 9893 counting only the distinct ones).

The product of its digits is 387072, while the sum is 48.

The square root of 128938728 is about 11355.1190218333. The cubic root of 128938728 is about 505.1974237081.

The spelling of 128938728 in words is "one hundred twenty-eight million, nine hundred thirty-eight thousand, seven hundred twenty-eight".