128913582879 has 24 divisors (see below), whose sum is σ = 189389101200. Its totient is φ = 84474800640.

The previous prime is 128913582877. The next prime is 128913582881. The reversal of 128913582879 is 978285319821.

128913582879 is a `hidden beast` number, since 128 + 91 + 358 + 2 + 8 + 79 = 666.

It is an interprime number because it is at equal distance from previous prime (128913582877) and next prime (128913582881).

It is not a de Polignac number, because 128913582879 - 2¹ = 128913582877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128913582877) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7249359 + ... + 7267119.

It is an arithmetic number, because the mean of its divisors is an integer number (7891212550).

Almost surely, 2^128913582879 is an apocalyptic number.

128913582879 is a deficient number, since it is larger than the sum of its proper divisors (60475518321).

128913582879 is a wasteful number, since it uses less digits than its factorization.

128913582879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31495 (or 31492 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 63.

The spelling of 128913582879 in words is "one hundred twenty-eight billion, nine hundred thirteen million, five hundred eighty-two thousand, eight hundred seventy-nine".