128118172 has 96 divisors (see below), whose sum is σ = 292118400. Its totient is φ = 47803392.

The previous prime is 128118149. The next prime is 128118187. The reversal of 128118172 is 271811821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 559354 + ... + 559582.

It is an arithmetic number, because the mean of its divisors is an integer number (3042900).

Almost surely, 2^128118172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128118172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146059200).

128118172 is an abundant number, since it is smaller than the sum of its proper divisors (164000228).

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

128118172 is a wasteful number, since it uses less digits than its factorization.

128118172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 333 counting only the distinct ones).

The product of its digits is 1792, while the sum is 31.

The square root of 128118172 is about 11318.9298080693. The cubic root of 128118172 is about 504.1234632863.

Adding to 128118172 its reverse (271811821), we get a palindrome (399929993).

The spelling of 128118172 in words is "one hundred twenty-eight million, one hundred eighteen thousand, one hundred seventy-two".