128979888 has 20 divisors (see below), whose sum is σ = 333198168. Its totient is φ = 42993280.

The previous prime is 128979881. The next prime is 128979889. The reversal of 128979888 is 888979821.

It is not an unprimeable number, because it can be changed into a prime (128979881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1343493 + ... + 1343588.

Almost surely, 2^128979888 is an apocalyptic number.

It is an amenable number.

128979888 is an abundant number, since it is smaller than the sum of its proper divisors (204218280).

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

128979888 is a wasteful number, since it uses less digits than its factorization.

128979888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687092 (or 2687086 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 60.

The square root of 128979888 is about 11356.9312756572. The cubic root of 128979888 is about 505.2511745970.

The spelling of 128979888 in words is "one hundred twenty-eight million, nine hundred seventy-nine thousand, eight hundred eighty-eight".