28573 has 2 divisors, whose sum is σ = 28574. Its totient is φ = 28572.

The previous prime is 28571. The next prime is 28579. The reversal of 28573 is 37582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14884 + 13689 = 122^2 + 117^2 .

It is a cyclic number.

It is not a de Polignac number, because 28573 - 2¹ = 28571 is a prime.

Together with 28571, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14286 + 14287.

It is an arithmetic number, because the mean of its divisors is an integer number (14287).

2²⁸⁵⁷³ is an apocalyptic number.

It is an amenable number.

28573 is a deficient number, since it is larger than the sum of its proper divisors (1).

28573 is an equidigital number, since it uses as much as digits as its factorization.

28573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 25.

The square root of 28573 is about 169.0354992302. The cubic root of 28573 is about 30.5716313326.

Subtracting 28573 from its reverse (37582), we obtain a palindrome (9009).

The spelling of 28573 in words is "twenty-eight thousand, five hundred seventy-three".