128805328 has 20 divisors (see below), whose sum is σ = 264240900. Its totient is φ = 60614144.

The previous prime is 128805307. The next prime is 128805331. The reversal of 128805328 is 823508821.

It can be written as a sum of positive squares in 2 ways, for example, as 101848464 + 26956864 = 10092^2 + 5192^2 .

It is a congruent number.

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, 236503 + ... + 237046.

It is an arithmetic number, because the mean of its divisors is an integer number (13212045).

Almost surely, 2^128805328 is an apocalyptic number.

It is an amenable number.

128805328 is an abundant number, since it is smaller than the sum of its proper divisors (135435572).

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

128805328 is a wasteful number, since it uses less digits than its factorization.

128805328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473574 (or 473568 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 128805328 is about 11349.2434990179. The cubic root of 128805328 is about 505.0231378478.

The spelling of 128805328 in words is "one hundred twenty-eight million, eight hundred five thousand, three hundred twenty-eight".