128839679 has 8 divisors (see below), whose sum is σ = 130088112. Its totient is φ = 127595520.

The previous prime is 128839673. The next prime is 128839681. The reversal of 128839679 is 976938821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128839679 - 2⁸ = 128839423 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 128839679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128839673) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 111167 + ... + 112319.

It is an arithmetic number, because the mean of its divisors is an integer number (16261014).

Almost surely, 2^128839679 is an apocalyptic number.

128839679 is a deficient number, since it is larger than the sum of its proper divisors (1248433).

128839679 is a wasteful number, since it uses less digits than its factorization.

128839679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137.

The product of its digits is 1306368, while the sum is 53.

The square root of 128839679 is about 11350.7567589126. The cubic root of 128839679 is about 505.0680286095.

The spelling of 128839679 in words is "one hundred twenty-eight million, eight hundred thirty-nine thousand, six hundred seventy-nine".