28979494311 has 4 divisors (see below), whose sum is σ = 38639325752. Its totient is φ = 19319662872.

The previous prime is 28979494309. The next prime is 28979494319. The reversal of 28979494311 is 11349497982.

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

It is not a de Polignac number, because 28979494311 - 2¹ = 28979494309 is a prime.

It is a super-2 number, since 2×28979494311² (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 (28979494319) 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, 4829915716 + ... + 4829915721.

It is an arithmetic number, because the mean of its divisors is an integer number (9659831438).

Almost surely, 2^28979494311 is an apocalyptic number.

28979494311 is a deficient number, since it is larger than the sum of its proper divisors (9659831441).

28979494311 is an equidigital number, since it uses as much as digits as its factorization.

28979494311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9659831440.

The product of its digits is 3919104, while the sum is 57.

The spelling of 28979494311 in words is "twenty-eight billion, nine hundred seventy-nine million, four hundred ninety-four thousand, three hundred eleven".