28279911 has 16 divisors (see below), whose sum is σ = 41258880. Its totient is φ = 17087520.

The previous prime is 28279871. The next prime is 28279913. The reversal of 28279911 is 11997282.

It is not a de Polignac number, because 28279911 - 2⁹ = 28279399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28279911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28279913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11736 + ... + 13938.

It is an arithmetic number, because the mean of its divisors is an integer number (2578680).

Almost surely, 2^28279911 is an apocalyptic number.

28279911 is a deficient number, since it is larger than the sum of its proper divisors (12978969).

28279911 is a wasteful number, since it uses less digits than its factorization.

28279911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606.

The product of its digits is 18144, while the sum is 39.

The square root of 28279911 is about 5317.8859521430. The cubic root of 28279911 is about 304.6674185371.

The spelling of 28279911 in words is "twenty-eight million, two hundred seventy-nine thousand, nine hundred eleven".