128757725 has 24 divisors (see below), whose sum is σ = 166513152. Its totient is φ = 98654400.

The previous prime is 128757721. The next prime is 128757731. The reversal of 128757725 is 527757821.

It is not a de Polignac number, because 128757725 - 2² = 128757721 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128757721) 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, 79019 + ... + 80631.

It is an arithmetic number, because the mean of its divisors is an integer number (6938048).

Almost surely, 2^128757725 is an apocalyptic number.

It is an amenable number.

128757725 is a deficient number, since it is larger than the sum of its proper divisors (37755427).

128757725 is a wasteful number, since it uses less digits than its factorization.

128757725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1757 (or 1752 counting only the distinct ones).

The product of its digits is 274400, while the sum is 44.

The square root of 128757725 is about 11347.1461169758. The cubic root of 128757725 is about 504.9609158393.

The spelling of 128757725 in words is "one hundred twenty-eight million, seven hundred fifty-seven thousand, seven hundred twenty-five".