128257173 has 36 divisors (see below), whose sum is σ = 205730304. Its totient is φ = 76356000.

The previous prime is 128257159. The next prime is 128257187. The reversal of 128257173 is 371752821.

128257173 is a `hidden beast` number, since 1 + 2 + 82 + 571 + 7 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (128257159) and next prime (128257187).

It is not a de Polignac number, because 128257173 - 2⁵ = 128257141 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 (128257123) 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 35 ways as a sum of consecutive naturals, for example, 1009836 + ... + 1009962.

Almost surely, 2^128257173 is an apocalyptic number.

It is an amenable number.

128257173 is a deficient number, since it is larger than the sum of its proper divisors (77473131).

128257173 is a wasteful number, since it uses less digits than its factorization.

128257173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 242 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 128257173 is about 11325.0683441646. The cubic root of 128257173 is about 504.3057125793.

The spelling of 128257173 in words is "one hundred twenty-eight million, two hundred fifty-seven thousand, one hundred seventy-three".