128700131928 has 128 divisors (see below), whose sum is σ = 344898025920. Its totient is φ = 39953571840.

The previous prime is 128700131909. The next prime is 128700131933. The reversal of 128700131928 is 829131007821.

It is a self number, because there is not a number n which added to its sum of digits gives 128700131928.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1896276 + ... + 1962972.

Almost surely, 2^128700131928 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 128700131928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172449012960).

128700131928 is an abundant number, since it is smaller than the sum of its proper divisors (216197893992).

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

128700131928 is a wasteful number, since it uses less digits than its factorization.

128700131928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66837 (or 66833 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 42.

The spelling of 128700131928 in words is "one hundred twenty-eight billion, seven hundred million, one hundred thirty-one thousand, nine hundred twenty-eight".