128944725 has 72 divisors (see below), whose sum is σ = 267170400. Its totient is φ = 54391680.

The previous prime is 128944723. The next prime is 128944727. The reversal of 128944725 is 527449821.

It is an interprime number because it is at equal distance from previous prime (128944723) and next prime (128944727).

It is not a de Polignac number, because 128944725 - 2¹ = 128944723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128944721) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 46426 + ... + 49124.

It is an arithmetic number, because the mean of its divisors is an integer number (3710700).

Almost surely, 2^128944725 is an apocalyptic number.

128944725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128944725 is an abundant number, since it is smaller than the sum of its proper divisors (138225675).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128944725 is a wasteful number, since it uses less digits than its factorization.

128944725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739 (or 2727 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 128944725 is about 11355.3830846872. The cubic root of 128944725 is about 505.2052559088.

The spelling of 128944725 in words is "one hundred twenty-eight million, nine hundred forty-four thousand, seven hundred twenty-five".