128189712 has 120 divisors (see below), whose sum is σ = 392052288. Its totient is φ = 35354880.

The previous prime is 128189687. The next prime is 128189723. The reversal of 128189712 is 217981821.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 322698 + ... + 323094.

Almost surely, 2^128189712 is an apocalyptic number.

128189712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128189712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196026144).

128189712 is an abundant number, since it is smaller than the sum of its proper divisors (263862576).

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

128189712 is a wasteful number, since it uses less digits than its factorization.

128189712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 440 counting only the distinct ones).

The product of its digits is 16128, while the sum is 39.

The square root of 128189712 is about 11322.0895597942. The cubic root of 128189712 is about 504.2172784501.

The spelling of 128189712 in words is "one hundred twenty-eight million, one hundred eighty-nine thousand, seven hundred twelve".