128875979725 has 24 divisors (see below), whose sum is σ = 160365885480. Its totient is φ = 102740352000.

The previous prime is 128875979723. The next prime is 128875979731. The reversal of 128875979725 is 527979578821.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 74392017001 + 54483962724 = 272749^2 + 233418^2 .

It is not a de Polignac number, because 128875979725 - 2¹ = 128875979723 is a prime.

It is a super-2 number, since 2×128875979725² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128875979723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8602041 + ... + 8617009.

It is an arithmetic number, because the mean of its divisors is an integer number (6681911895).

Almost surely, 2^128875979725 is an apocalyptic number.

It is an amenable number.

128875979725 is a deficient number, since it is larger than the sum of its proper divisors (31489905755).

128875979725 is a wasteful number, since it uses less digits than its factorization.

128875979725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16161 (or 16156 counting only the distinct ones).

The product of its digits is 177811200, while the sum is 70.

The spelling of 128875979725 in words is "one hundred twenty-eight billion, eight hundred seventy-five million, nine hundred seventy-nine thousand, seven hundred twenty-five".