128688936 has 32 divisors (see below), whose sum is σ = 332102400. Its totient is φ = 41512320.

The previous prime is 128688913. The next prime is 128688949. The reversal of 128688936 is 639886821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85741 + ... + 87228.

It is an arithmetic number, because the mean of its divisors is an integer number (10378200).

Almost surely, 2^128688936 is an apocalyptic number.

It is an amenable number.

128688936 is an abundant number, since it is smaller than the sum of its proper divisors (203413464).

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

128688936 is a wasteful number, since it uses less digits than its factorization.

128688936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173009 (or 173005 counting only the distinct ones).

The product of its digits is 995328, while the sum is 51.

The square root of 128688936 is about 11344.1145974466. The cubic root of 128688936 is about 504.8709744549.

The spelling of 128688936 in words is "one hundred twenty-eight million, six hundred eighty-eight thousand, nine hundred thirty-six".