128686927538 has 64 divisors (see below), whose sum is σ = 220761096192. Its totient is φ = 55813665600.

The previous prime is 128686927529. The next prime is 128686927547. The reversal of 128686927538 is 835729686821.

It is an interprime number because it is at equal distance from previous prime (128686927529) and next prime (128686927547).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7814213 + ... + 7830663.

It is an arithmetic number, because the mean of its divisors is an integer number (3449392128).

Almost surely, 2^128686927538 is an apocalyptic number.

128686927538 is a deficient number, since it is larger than the sum of its proper divisors (92074168654).

128686927538 is a wasteful number, since it uses less digits than its factorization.

128686927538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16719.

The product of its digits is 69672960, while the sum is 65.

The spelling of 128686927538 in words is "one hundred twenty-eight billion, six hundred eighty-six million, nine hundred twenty-seven thousand, five hundred thirty-eight".