128391385256 has 16 divisors (see below), whose sum is σ = 240762758400. Its totient is φ = 64187983024.

The previous prime is 128391385249. The next prime is 128391385261. The reversal of 128391385256 is 652583193821.

It is a super-2 number, since 2×128391385256² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128391385198 and 128391385207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892616 + ... + 1026423.

It is an arithmetic number, because the mean of its divisors is an integer number (15047672400).

Almost surely, 2^128391385256 is an apocalyptic number.

It is an amenable number.

128391385256 is a deficient number, since it is larger than the sum of its proper divisors (112371373144).

128391385256 is a wasteful number, since it uses less digits than its factorization.

128391385256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927408 (or 1927404 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 53.

The spelling of 128391385256 in words is "one hundred twenty-eight billion, three hundred ninety-one million, three hundred eighty-five thousand, two hundred fifty-six".