128609912 has 16 divisors (see below), whose sum is σ = 242478600. Its totient is φ = 63948960.

The previous prime is 128609909. The next prime is 128609927. The reversal of 128609912 is 219906821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42962 + ... + 45857.

Almost surely, 2^128609912 is an apocalyptic number.

It is an amenable number.

128609912 is a deficient number, since it is larger than the sum of its proper divisors (113868688).

128609912 is a wasteful number, since it uses less digits than its factorization.

128609912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89006 (or 89002 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 128609912 is about 11340.6310230075. The cubic root of 128609912 is about 504.7676112743.

The spelling of 128609912 in words is "one hundred twenty-eight million, six hundred nine thousand, nine hundred twelve".