28566845 has 4 divisors (see below), whose sum is σ = 34280220. Its totient is φ = 22853472.

The previous prime is 28566833. The next prime is 28566847. The reversal of 28566845 is 54866582.

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 19061956 + 9504889 = 4366^2 + 3083^2 .

It is a cyclic number.

It is not a de Polignac number, because 28566845 - 2¹⁸ = 28304701 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28566796 and 28566805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28566847) 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, 2856680 + ... + 2856689.

It is an arithmetic number, because the mean of its divisors is an integer number (8570055).

Almost surely, 2^28566845 is an apocalyptic number.

It is an amenable number.

28566845 is a deficient number, since it is larger than the sum of its proper divisors (5713375).

28566845 is an equidigital number, since it uses as much as digits as its factorization.

28566845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5713374.

The product of its digits is 460800, while the sum is 44.

The square root of 28566845 is about 5344.7960672041. The cubic root of 28566845 is about 305.6943599784.

The spelling of 28566845 in words is "twenty-eight million, five hundred sixty-six thousand, eight hundred forty-five".