28085465 has 4 divisors (see below), whose sum is σ = 33702564. Its totient is φ = 22468368.

The previous prime is 28085459. The next prime is 28085489. The reversal of 28085465 is 56458082.

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 7118224 + 20967241 = 2668^2 + 4579^2 .

It is a cyclic number.

It is not a de Polignac number, because 28085465 - 2¹⁴ = 28069081 is a prime.

It is a Duffinian number.

It is a Curzon 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, 2808542 + ... + 2808551.

It is an arithmetic number, because the mean of its divisors is an integer number (8425641).

Almost surely, 2^28085465 is an apocalyptic number.

It is an amenable number.

28085465 is a deficient number, since it is larger than the sum of its proper divisors (5617099).

28085465 is an equidigital number, since it uses as much as digits as its factorization.

28085465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5617098.

The product of its (nonzero) digits is 76800, while the sum is 38.

The square root of 28085465 is about 5299.5721525421. The cubic root of 28085465 is about 303.9675382293.

The spelling of 28085465 in words is "twenty-eight million, eighty-five thousand, four hundred sixty-five".