128829978387 has 64 divisors (see below), whose sum is σ = 213785510400. Its totient is φ = 76000498560.

The previous prime is 128829978349. The next prime is 128829978397. The reversal of 128829978387 is 783879928821.

128829978387 is a `hidden beast` number, since 12 + 8 + 82 + 99 + 78 + 387 = 666.

It is not a de Polignac number, because 128829978387 - 2¹⁵ = 128829945619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128829978307) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3724689 + ... + 3759117.

It is an arithmetic number, because the mean of its divisors is an integer number (3340398600).

Almost surely, 2^128829978387 is an apocalyptic number.

128829978387 is a deficient number, since it is larger than the sum of its proper divisors (84955532013).

128829978387 is a wasteful number, since it uses less digits than its factorization.

128829978387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34785 (or 34779 counting only the distinct ones).

The product of its digits is 195084288, while the sum is 72.

The spelling of 128829978387 in words is "one hundred twenty-eight billion, eight hundred twenty-nine million, nine hundred seventy-eight thousand, three hundred eighty-seven".