128991794448 has 240 divisors, whose sum is σ = 388168905600. Its totient is φ = 36818073600.

The previous prime is 128991794389. The next prime is 128991794453. The reversal of 128991794448 is 844497199821.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6896373 + ... + 6915051.

It is an arithmetic number, because the mean of its divisors is an integer number (1617370440).

Almost surely, 2^128991794448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128991794448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194084452800).

128991794448 is an abundant number, since it is smaller than the sum of its proper divisors (259177111152).

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

128991794448 is a wasteful number, since it uses less digits than its factorization.

128991794448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18782 (or 18765 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 66.

The spelling of 128991794448 in words is "one hundred twenty-eight billion, nine hundred ninety-one million, seven hundred ninety-four thousand, four hundred forty-eight".