28684859 has 4 divisors (see below), whose sum is σ = 32782704. Its totient is φ = 24587016.

The previous prime is 28684853. The next prime is 28684867. The reversal of 28684859 is 95848682.

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

It is a cyclic number.

It is not a de Polignac number, because 28684859 - 2⁸ = 28684603 is a prime.

It is a super-2 number, since 2×28684859² = 1645642271699762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28684853) 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, 2048912 + ... + 2048925.

It is an arithmetic number, because the mean of its divisors is an integer number (8195676).

Almost surely, 2^28684859 is an apocalyptic number.

28684859 is a deficient number, since it is larger than the sum of its proper divisors (4097845).

28684859 is an equidigital number, since it uses as much as digits as its factorization.

28684859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4097844.

The product of its digits is 1105920, while the sum is 50.

The square root of 28684859 is about 5355.8247730858. The cubic root of 28684859 is about 306.1147383240.

The spelling of 28684859 in words is "twenty-eight million, six hundred eighty-four thousand, eight hundred fifty-nine".