28817279 has 4 divisors (see below), whose sum is σ = 28900200. Its totient is φ = 28734360.

The previous prime is 28817273. The next prime is 28817287. The reversal of 28817279 is 97271882.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28817279 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 (28817273) 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, 40937 + ... + 41634.

It is an arithmetic number, because the mean of its divisors is an integer number (7225050).

Almost surely, 2^28817279 is an apocalyptic number.

28817279 is a deficient number, since it is larger than the sum of its proper divisors (82921).

28817279 is an equidigital number, since it uses as much as digits as its factorization.

28817279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82920.

The product of its digits is 112896, while the sum is 44.

The square root of 28817279 is about 5368.1727803788. The cubic root of 28817279 is about 306.5850619088.

The spelling of 28817279 in words is "twenty-eight million, eight hundred seventeen thousand, two hundred seventy-nine".