23128385279 has 4 divisors (see below), whose sum is σ = 23294776680. Its totient is φ = 22961993880.

The previous prime is 23128385251. The next prime is 23128385353. The reversal of 23128385279 is 97258382132.

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 23128385279 - 2²⁴ = 23111608063 is a prime.

It is a super-2 number, since 2×23128385279² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23128382279) 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, 83195492 + ... + 83195769.

It is an arithmetic number, because the mean of its divisors is an integer number (5823694170).

Almost surely, 2^23128385279 is an apocalyptic number.

23128385279 is a deficient number, since it is larger than the sum of its proper divisors (166391401).

23128385279 is a wasteful number, since it uses less digits than its factorization.

23128385279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166391400.

The product of its digits is 1451520, while the sum is 50.

The spelling of 23128385279 in words is "twenty-three billion, one hundred twenty-eight million, three hundred eighty-five thousand, two hundred seventy-nine".