128223172 has 48 divisors (see below), whose sum is σ = 294497280. Its totient is φ = 47325600.

The previous prime is 128223149. The next prime is 128223187. The reversal of 128223172 is 271322821.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 128223172.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5104 + ... + 16807.

It is an arithmetic number, because the mean of its divisors is an integer number (6135360).

Almost surely, 2^128223172 is an apocalyptic number.

It is an amenable number.

128223172 is an abundant number, since it is smaller than the sum of its proper divisors (166274108).

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

128223172 is a wasteful number, since it uses less digits than its factorization.

128223172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21952 (or 21950 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 128223172 is about 11323.5671058196. The cubic root of 128223172 is about 504.2611447952.

Adding to 128223172 its reverse (271322821), we get a palindrome (399545993).

The spelling of 128223172 in words is "one hundred twenty-eight million, two hundred twenty-three thousand, one hundred seventy-two".