128879025279 has 4 divisors (see below), whose sum is σ = 171838700376. Its totient is φ = 85919350184.

The previous prime is 128879025271. The next prime is 128879025283. The reversal of 128879025279 is 972520978821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128879025279 - 2³ = 128879025271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128879025271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21479837544 + ... + 21479837549.

It is an arithmetic number, because the mean of its divisors is an integer number (42959675094).

Almost surely, 2^128879025279 is an apocalyptic number.

128879025279 is a deficient number, since it is larger than the sum of its proper divisors (42959675097).

128879025279 is an equidigital number, since it uses as much as digits as its factorization.

128879025279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42959675096.

The product of its (nonzero) digits is 10160640, while the sum is 60.

The spelling of 128879025279 in words is "one hundred twenty-eight billion, eight hundred seventy-nine million, twenty-five thousand, two hundred seventy-nine".