128815705872 has 120 divisors (see below), whose sum is σ = 429919161984. Its totient is φ = 35204285952.

The previous prime is 128815705859. The next prime is 128815705873. The reversal of 128815705872 is 278507518821.

128815705872 is a `hidden beast` number, since 1 + 2 + 8 + 8 + 1 + 57 + 0 + 587 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (128815705873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2754933 + ... + 2801300.

Almost surely, 2^128815705872 is an apocalyptic number.

128815705872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128815705872 is an abundant number, since it is smaller than the sum of its proper divisors (301103456112).

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

128815705872 is a wasteful number, since it uses less digits than its factorization.

128815705872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5556277 (or 5556268 counting only the distinct ones).

The product of its (nonzero) digits is 2508800, while the sum is 54.

The spelling of 128815705872 in words is "one hundred twenty-eight billion, eight hundred fifteen million, seven hundred five thousand, eight hundred seventy-two".