128509902 has 40 divisors (see below), whose sum is σ = 304902576. Its totient is φ = 40315968.

The previous prime is 128509879. The next prime is 128509937. The reversal of 128509902 is 209905821.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 20578 + ... + 26085.

Almost surely, 2^128509902 is an apocalyptic number.

128509902 is an abundant number, since it is smaller than the sum of its proper divisors (176392674).

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

128509902 is a wasteful number, since it uses less digits than its factorization.

128509902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46694 (or 46685 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 128509902 is about 11336.2207988377. The cubic root of 128509902 is about 504.6367377438.

The spelling of 128509902 in words is "one hundred twenty-eight million, five hundred nine thousand, nine hundred two".