128944654778 has 16 divisors (see below), whose sum is σ = 194132574720. Its totient is φ = 64233922896.

The previous prime is 128944654777. The next prime is 128944654789. The reversal of 128944654778 is 877456449821.

It is not an unprimeable number, because it can be changed into a prime (128944654777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2149751 + ... + 2208917.

It is an arithmetic number, because the mean of its divisors is an integer number (12133285920).

Almost surely, 2^128944654778 is an apocalyptic number.

128944654778 is a deficient number, since it is larger than the sum of its proper divisors (65187919942).

128944654778 is a wasteful number, since it uses less digits than its factorization.

128944654778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63181.

The product of its digits is 108380160, while the sum is 65.

The spelling of 128944654778 in words is "one hundred twenty-eight billion, nine hundred forty-four million, six hundred fifty-four thousand, seven hundred seventy-eight".