128804992 has 32 divisors (see below), whose sum is σ = 263548620. Its totient is φ = 62659584.

The previous prime is 128804953. The next prime is 128805007. The reversal of 128804992 is 299408821.

It can be written as a sum of positive squares in 2 ways, for example, as 120648256 + 8156736 = 10984^2 + 2856^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 8863 + ... + 18334.

Almost surely, 2^128804992 is an apocalyptic number.

It is an amenable number.

128804992 is an abundant number, since it is smaller than the sum of its proper divisors (134743628).

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

128804992 is an equidigital number, since it uses as much as digits as its factorization.

128804992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27248 (or 27236 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 128804992 is about 11349.2286962595. The cubic root of 128804992 is about 505.0226987150.

The spelling of 128804992 in words is "one hundred twenty-eight million, eight hundred four thousand, nine hundred ninety-two".