128690908 has 12 divisors (see below), whose sum is σ = 228381552. Its totient is φ = 63439040.

The previous prime is 128690879. The next prime is 128690909. The reversal of 128690908 is 809096821.

It is a happy number.

It is a super-2 number, since 2×128690908² = 33122699603728928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128690909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226285 + ... + 226852.

It is an arithmetic number, because the mean of its divisors is an integer number (19031796).

Almost surely, 2^128690908 is an apocalyptic number.

It is an amenable number.

128690908 is a deficient number, since it is larger than the sum of its proper divisors (99690644).

128690908 is a wasteful number, since it uses less digits than its factorization.

128690908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453212 (or 453210 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 128690908 is about 11344.2015144302. The cubic root of 128690908 is about 504.8735532844.

The spelling of 128690908 in words is "one hundred twenty-eight million, six hundred ninety thousand, nine hundred eight".