128672725 has 12 divisors (see below), whose sum is σ = 159743620. Its totient is φ = 102816000.

The previous prime is 128672683. The next prime is 128672749. The reversal of 128672725 is 527276821.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 43903876 + 84768849 = 6626^2 + 9207^2 .

It is not a de Polignac number, because 128672725 - 2⁷ = 128672597 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 22675 + ... + 27775.

Almost surely, 2^128672725 is an apocalyptic number.

It is an amenable number.

128672725 is a deficient number, since it is larger than the sum of its proper divisors (31070895).

128672725 is a wasteful number, since it uses less digits than its factorization.

128672725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6120 (or 6115 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 128672725 is about 11343.4000634730. The cubic root of 128672725 is about 504.8497739608.

The spelling of 128672725 in words is "one hundred twenty-eight million, six hundred seventy-two thousand, seven hundred twenty-five".