128979618 has 32 divisors (see below), whose sum is σ = 265664256. Its totient is φ = 41722128.

The previous prime is 128979589. The next prime is 128979637. The reversal of 128979618 is 816979821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40521 + ... + 43587.

It is an arithmetic number, because the mean of its divisors is an integer number (8302008).

Almost surely, 2^128979618 is an apocalyptic number.

128979618 is an abundant number, since it is smaller than the sum of its proper divisors (136684638).

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

128979618 is a wasteful number, since it uses less digits than its factorization.

128979618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3278.

The product of its digits is 435456, while the sum is 51.

The square root of 128979618 is about 11356.9193886370. The cubic root of 128979618 is about 505.2508220410.

The spelling of 128979618 in words is "one hundred twenty-eight million, nine hundred seventy-nine thousand, six hundred eighteen".