128118725 has 24 divisors (see below), whose sum is σ = 182220480. Its totient is φ = 87534720.

The previous prime is 128118721. The next prime is 128118761. The reversal of 128118725 is 527811821.

It is not a de Polignac number, because 128118725 - 2² = 128118721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128118721) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 53606 + ... + 55944.

It is an arithmetic number, because the mean of its divisors is an integer number (7592520).

Almost surely, 2^128118725 is an apocalyptic number.

It is an amenable number.

128118725 is a deficient number, since it is larger than the sum of its proper divisors (54101755).

128118725 is a wasteful number, since it uses less digits than its factorization.

128118725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669 (or 2664 counting only the distinct ones).

The product of its digits is 8960, while the sum is 35.

The square root of 128118725 is about 11318.9542361474. The cubic root of 128118725 is about 504.1241886060.

The spelling of 128118725 in words is "one hundred twenty-eight million, one hundred eighteen thousand, seven hundred twenty-five".