28585613 has 4 divisors (see below), whose sum is σ = 32669280. Its totient is φ = 24501948.

The previous prime is 28585607. The next prime is 28585621. The reversal of 28585613 is 31658582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31658582 = 2 ⋅15829291.

It is a cyclic number.

It is not a de Polignac number, because 28585613 - 2⁶ = 28585549 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28585663) 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, 2041823 + ... + 2041836.

It is an arithmetic number, because the mean of its divisors is an integer number (8167320).

Almost surely, 2^28585613 is an apocalyptic number.

It is an amenable number.

28585613 is a deficient number, since it is larger than the sum of its proper divisors (4083667).

28585613 is an equidigital number, since it uses as much as digits as its factorization.

28585613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4083666.

The product of its digits is 57600, while the sum is 38.

The square root of 28585613 is about 5346.5515054098. The cubic root of 28585613 is about 305.7612908998.

The spelling of 28585613 in words is "twenty-eight million, five hundred eighty-five thousand, six hundred thirteen".