28286585 has 4 divisors (see below), whose sum is σ = 33943908. Its totient is φ = 22629264.

The previous prime is 28286579. The next prime is 28286593. The reversal of 28286585 is 58568282.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4734976 + 23551609 = 2176^2 + 4853^2 .

It is a cyclic number.

It is not a de Polignac number, because 28286585 - 2¹² = 28282489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2828654 + ... + 2828663.

It is an arithmetic number, because the mean of its divisors is an integer number (8485977).

Almost surely, 2^28286585 is an apocalyptic number.

It is an amenable number.

28286585 is a deficient number, since it is larger than the sum of its proper divisors (5657323).

28286585 is an equidigital number, since it uses as much as digits as its factorization.

28286585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5657322.

The product of its digits is 307200, while the sum is 44.

The square root of 28286585 is about 5318.5134201203. The cubic root of 28286585 is about 304.6913836104.

The spelling of 28286585 in words is "twenty-eight million, two hundred eighty-six thousand, five hundred eighty-five".