128219172 has 24 divisors (see below), whose sum is σ = 299730816. Its totient is φ = 42660768.

The previous prime is 128219153. The next prime is 128219183. The reversal of 128219172 is 271912821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2908 + ... + 16275.

It is an arithmetic number, because the mean of its divisors is an integer number (12488784).

Almost surely, 2^128219172 is an apocalyptic number.

128219172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128219172 is an abundant number, since it is smaller than the sum of its proper divisors (171511644).

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

128219172 is a wasteful number, since it uses less digits than its factorization.

128219172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19747 (or 19745 counting only the distinct ones).

The product of its digits is 4032, while the sum is 33.

The square root of 128219172 is about 11323.3904816535. The cubic root of 128219172 is about 504.2559011628.

The spelling of 128219172 in words is "one hundred twenty-eight million, two hundred nineteen thousand, one hundred seventy-two".