128188172 has 24 divisors (see below), whose sum is σ = 256790016. Its totient is φ = 54849168.

The previous prime is 128188147. The next prime is 128188183. The reversal of 128188172 is 271881821.

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 7 ways as a sum of consecutive naturals, for example, 15773 + ... + 22475.

It is an arithmetic number, because the mean of its divisors is an integer number (10699584).

Almost surely, 2^128188172 is an apocalyptic number.

It is an amenable number.

128188172 is an abundant number, since it is smaller than the sum of its proper divisors (128601844).

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

128188172 is a wasteful number, since it uses less digits than its factorization.

128188172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7397 (or 7395 counting only the distinct ones).

The product of its digits is 14336, while the sum is 38.

The square root of 128188172 is about 11322.0215509422. The cubic root of 128188172 is about 504.2152593132.

The spelling of 128188172 in words is "one hundred twenty-eight million, one hundred eighty-eight thousand, one hundred seventy-two".