28173847679 has 4 divisors (see below), whose sum is σ = 28174577760. Its totient is φ = 28173117600.

The previous prime is 28173847661. The next prime is 28173847693. The reversal of 28173847679 is 97674837182.

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 28173847679 - 2²⁰ = 28172799103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28173847279) 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, 303722 + ... + 385479.

It is an arithmetic number, because the mean of its divisors is an integer number (7043644440).

Almost surely, 2^28173847679 is an apocalyptic number.

28173847679 is a deficient number, since it is larger than the sum of its proper divisors (730081).

28173847679 is an equidigital number, since it uses as much as digits as its factorization.

28173847679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730080.

The product of its digits is 28449792, while the sum is 62.

The spelling of 28173847679 in words is "twenty-eight billion, one hundred seventy-three million, eight hundred forty-seven thousand, six hundred seventy-nine".