28879942236 has 24 divisors (see below), whose sum is σ = 68491230864. Its totient is φ = 9468833280.

The previous prime is 28879942229. The next prime is 28879942253. The reversal of 28879942236 is 63224997882.

It is a self number, because there is not a number n which added to its sum of digits gives 28879942236.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19726005 + ... + 19727468.

It is an arithmetic number, because the mean of its divisors is an integer number (2853801286).

Almost surely, 2^28879942236 is an apocalyptic number.

It is an amenable number.

28879942236 is an abundant number, since it is smaller than the sum of its proper divisors (39611288628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28879942236 is a wasteful number, since it uses less digits than its factorization.

28879942236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39453541 (or 39453539 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 60.

The spelling of 28879942236 in words is "twenty-eight billion, eight hundred seventy-nine million, nine hundred forty-two thousand, two hundred thirty-six".