128978644795 has 256 divisors, whose sum is σ = 228898897920. Its totient is φ = 67151462400.

The previous prime is 128978644789. The next prime is 128978644811. The reversal of 128978644795 is 597446879821.

It is not a de Polignac number, because 128978644795 - 2⁷ = 128978644667 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 167722171 + ... + 167722939.

It is an arithmetic number, because the mean of its divisors is an integer number (894136320).

Almost surely, 2^128978644795 is an apocalyptic number.

128978644795 is a deficient number, since it is larger than the sum of its proper divisors (99920253125).

128978644795 is a wasteful number, since it uses less digits than its factorization.

128978644795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906.

The product of its digits is 243855360, while the sum is 70.

The spelling of 128978644795 in words is "one hundred twenty-eight billion, nine hundred seventy-eight million, six hundred forty-four thousand, seven hundred ninety-five".