128809368 has 48 divisors (see below), whose sum is σ = 349380720. Its totient is φ = 42872256.

The previous prime is 128809367. The next prime is 128809423. The reversal of 128809368 is 863908821.

128809368 is a `hidden beast` number, since 1 + 288 + 0 + 9 + 368 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128809367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93130 + ... + 94502.

It is an arithmetic number, because the mean of its divisors is an integer number (7278765).

Almost surely, 2^128809368 is an apocalyptic number.

128809368 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128809368 is an abundant number, since it is smaller than the sum of its proper divisors (220571352).

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

128809368 is a wasteful number, since it uses less digits than its factorization.

128809368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688 (or 2681 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 128809368 is about 11349.4214830537. The cubic root of 128809368 is about 505.0284178368.

The spelling of 128809368 in words is "one hundred twenty-eight million, eight hundred nine thousand, three hundred sixty-eight".