128195725 has 48 divisors (see below), whose sum is σ = 197237376. Its totient is φ = 80640000.

The previous prime is 128195701. The next prime is 128195729. The reversal of 128195725 is 527591821.

It is not a de Polignac number, because 128195725 - 2⁷ = 128195597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128195729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121450 + ... + 122500.

It is an arithmetic number, because the mean of its divisors is an integer number (4109112).

Almost surely, 2^128195725 is an apocalyptic number.

It is an amenable number.

128195725 is a deficient number, since it is larger than the sum of its proper divisors (69041651).

128195725 is a wasteful number, since it uses less digits than its factorization.

128195725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126 (or 1121 counting only the distinct ones).

The product of its digits is 50400, while the sum is 40.

The square root of 128195725 is about 11322.3550995365. The cubic root of 128195725 is about 504.2251621069.

The spelling of 128195725 in words is "one hundred twenty-eight million, one hundred ninety-five thousand, seven hundred twenty-five".