28584817 has 4 divisors (see below), whose sum is σ = 28638196. Its totient is φ = 28531440.

The previous prime is 28584811. The next prime is 28584823. The reversal of 28584817 is 71848582.

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

It is an interprime number because it is at equal distance from previous prime (28584811) and next prime (28584823).

It can be written as a sum of positive squares in 2 ways, for example, as 3594816 + 24990001 = 1896^2 + 4999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28584817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28584811) by changing a digit.

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, 25878 + ... + 26959.

It is an arithmetic number, because the mean of its divisors is an integer number (7159549).

Almost surely, 2^28584817 is an apocalyptic number.

It is an amenable number.

28584817 is a deficient number, since it is larger than the sum of its proper divisors (53379).

28584817 is an equidigital number, since it uses as much as digits as its factorization.

28584817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53378.

The product of its digits is 143360, while the sum is 43.

The square root of 28584817 is about 5346.4770643855. The cubic root of 28584817 is about 305.7584527793.

The spelling of 28584817 in words is "twenty-eight million, five hundred eighty-four thousand, eight hundred seventeen".