128899908 has 18 divisors (see below), whose sum is σ = 325830414. Its totient is φ = 42966624.

The previous prime is 128899879. The next prime is 128899909. The reversal of 128899908 is 809998821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 125484804 + 3415104 = 11202^2 + 1848^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (128899909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1790241 + ... + 1790312.

Almost surely, 2^128899908 is an apocalyptic number.

128899908 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128899908 is an abundant number, since it is smaller than the sum of its proper divisors (196930506).

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

128899908 is a wasteful number, since it uses less digits than its factorization.

128899908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3580563 (or 3580558 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 54.

The square root of 128899908 is about 11353.4095319424. The cubic root of 128899908 is about 505.1467181448.

The spelling of 128899908 in words is "one hundred twenty-eight million, eight hundred ninety-nine thousand, nine hundred eight".