128639164 has 12 divisors (see below), whose sum is σ = 226762704. Its totient is φ = 63849824.

The previous prime is 128639123. The next prime is 128639171. The reversal of 128639164 is 461936821.

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, 116824 + ... + 117919.

It is an arithmetic number, because the mean of its divisors is an integer number (18896892).

Almost surely, 2^128639164 is an apocalyptic number.

It is an amenable number.

128639164 is a deficient number, since it is larger than the sum of its proper divisors (98123540).

128639164 is a wasteful number, since it uses less digits than its factorization.

128639164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234884 (or 234882 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 128639164 is about 11341.9206486380. The cubic root of 128639164 is about 504.8058777465.

The spelling of 128639164 in words is "one hundred twenty-eight million, six hundred thirty-nine thousand, one hundred sixty-four".