28530085 has 4 divisors (see below), whose sum is σ = 34236108. Its totient is φ = 22824064.

The previous prime is 28530043. The next prime is 28530119. The reversal of 28530085 is 58003582.

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 6543364 + 21986721 = 2558^2 + 4689^2 .

It is a cyclic number.

It is not a de Polignac number, because 28530085 - 2¹¹ = 28528037 is a prime.

It is a Smith number, since the sum of its digits (31) 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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2853004 + ... + 2853013.

It is an arithmetic number, because the mean of its divisors is an integer number (8559027).

Almost surely, 2^28530085 is an apocalyptic number.

It is an amenable number.

28530085 is a deficient number, since it is larger than the sum of its proper divisors (5706023).

28530085 is an equidigital number, since it uses as much as digits as its factorization.

28530085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5706022.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 28530085 is about 5341.3561012162. The cubic root of 28530085 is about 305.5631805382.

The spelling of 28530085 in words is "twenty-eight million, five hundred thirty thousand, eighty-five".