128113891992 has 48 divisors (see below), whose sum is σ = 347747985000. Its totient is φ = 42609509376.

The previous prime is 128113891943. The next prime is 128113892003. The reversal of 128113891992 is 299198311821.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1949142 + ... + 2013797.

Almost surely, 2^128113891992 is an apocalyptic number.

128113891992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128113891992 is an abundant number, since it is smaller than the sum of its proper divisors (219634093008).

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

128113891992 is a wasteful number, since it uses less digits than its factorization.

128113891992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963400 (or 3963393 counting only the distinct ones).

The product of its digits is 559872, while the sum is 54.

The spelling of 128113891992 in words is "one hundred twenty-eight billion, one hundred thirteen million, eight hundred ninety-one thousand, nine hundred ninety-two".