28408585 has 4 divisors (see below), whose sum is σ = 34090308. Its totient is φ = 22726864.

The previous prime is 28408577. The next prime is 28408609. The reversal of 28408585 is 58580482.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58580482 = 2 ⋅29290241.

It can be written as a sum of positive squares in 2 ways, for example, as 17065161 + 11343424 = 4131^2 + 3368^2 .

It is a cyclic number.

It is not a de Polignac number, because 28408585 - 2³ = 28408577 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2840854 + ... + 2840863.

It is an arithmetic number, because the mean of its divisors is an integer number (8522577).

Almost surely, 2^28408585 is an apocalyptic number.

It is an amenable number.

28408585 is a deficient number, since it is larger than the sum of its proper divisors (5681723).

28408585 is an equidigital number, since it uses as much as digits as its factorization.

28408585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5681722.

The product of its (nonzero) digits is 102400, while the sum is 40.

The square root of 28408585 is about 5329.9704501995. The cubic root of 28408585 is about 305.1287998515.

The spelling of 28408585 in words is "twenty-eight million, four hundred eight thousand, five hundred eighty-five".