128919172 has 6 divisors (see below), whose sum is σ = 225608558. Its totient is φ = 64459584.

The previous prime is 128919151. The next prime is 128919187. The reversal of 128919172 is 271919821.

It can be written as a sum of positive squares in only one way, i.e., 106791556 + 22127616 = 10334^2 + 4704^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16114893 + ... + 16114900.

Almost surely, 2^128919172 is an apocalyptic number.

It is an amenable number.

128919172 is a deficient number, since it is larger than the sum of its proper divisors (96689386).

128919172 is a wasteful number, since it uses less digits than its factorization.

128919172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32229797 (or 32229795 counting only the distinct ones).

The product of its digits is 18144, while the sum is 40.

The square root of 128919172 is about 11354.2578797559. The cubic root of 128919172 is about 505.1718814978.

The spelling of 128919172 in words is "one hundred twenty-eight million, nine hundred nineteen thousand, one hundred seventy-two".