128742172 has 54 divisors (see below), whose sum is σ = 252193032. Its totient is φ = 57474144.

The previous prime is 128742161. The next prime is 128742181. The reversal of 128742172 is 271247821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1249873 + ... + 1249975.

Almost surely, 2^128742172 is an apocalyptic number.

It is an amenable number.

128742172 is a deficient number, since it is larger than the sum of its proper divisors (123450860).

128742172 is a wasteful number, since it uses less digits than its factorization.

128742172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 161 counting only the distinct ones).

The product of its digits is 12544, while the sum is 34.

The square root of 128742172 is about 11346.4607697731. The cubic root of 128742172 is about 504.9405831477.

Adding to 128742172 its reverse (271247821), we get a palindrome (399989993).

The spelling of 128742172 in words is "one hundred twenty-eight million, seven hundred forty-two thousand, one hundred seventy-two".