28279569879 has 32 divisors (see below), whose sum is σ = 46011168000. Its totient is φ = 17024078880.

The previous prime is 28279569869. The next prime is 28279569883. The reversal of 28279569879 is 97896597282.

It is a de Polignac number, because none of the positive numbers 2^k-28279569879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28279569839) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 275269 + ... + 363774.

It is an arithmetic number, because the mean of its divisors is an integer number (1437849000).

Almost surely, 2^28279569879 is an apocalyptic number.

28279569879 is a deficient number, since it is larger than the sum of its proper divisors (17731598121).

28279569879 is a wasteful number, since it uses less digits than its factorization.

28279569879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639212 (or 639206 counting only the distinct ones).

The product of its digits is 274337280, while the sum is 72.

The spelling of 28279569879 in words is "twenty-eight billion, two hundred seventy-nine million, five hundred sixty-nine thousand, eight hundred seventy-nine".