128128928 has 24 divisors (see below), whose sum is σ = 259073892. Its totient is φ = 62332416.

The previous prime is 128128927. The next prime is 128128933. The reversal of 128128928 is 829821821.

It can be written as a sum of positive squares in 2 ways, for example, as 127870864 + 258064 = 11308^2 + 508^2 .

It is not an unprimeable number, because it can be changed into a prime (128128927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52925 + ... + 55292.

Almost surely, 2^128128928 is an apocalyptic number.

It is an amenable number.

128128928 is an abundant number, since it is smaller than the sum of its proper divisors (130944964).

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

128128928 is a wasteful number, since it uses less digits than its factorization.

128128928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108264 (or 108256 counting only the distinct ones).

The product of its digits is 36864, while the sum is 41.

The square root of 128128928 is about 11319.4049313557. The cubic root of 128128928 is about 504.1375705753.

The spelling of 128128928 in words is "one hundred twenty-eight million, one hundred twenty-eight thousand, nine hundred twenty-eight".