128191042812 has 96 divisors (see below), whose sum is σ = 353536081920. Its totient is φ = 35392893120.

The previous prime is 128191042789. The next prime is 128191042831. The reversal of 128191042812 is 218240191821.

128191042812 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106387 + ... + 517397.

It is an arithmetic number, because the mean of its divisors is an integer number (3682667520).

Almost surely, 2^128191042812 is an apocalyptic number.

128191042812 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 128191042812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176768040960).

128191042812 is an abundant number, since it is smaller than the sum of its proper divisors (225345039108).

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

128191042812 is a wasteful number, since it uses less digits than its factorization.

128191042812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411151 (or 411149 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 39.

The spelling of 128191042812 in words is "one hundred twenty-eight billion, one hundred ninety-one million, forty-two thousand, eight hundred twelve".