28563 has 4 divisors (see below), whose sum is σ = 38088. Its totient is φ = 19040.

The previous prime is 28559. The next prime is 28571. The reversal of 28563 is 36582.

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

It is a cyclic number.

It is not a de Polignac number, because 28563 - 2² = 28559 is a prime.

It is a D-number.

28563 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (28513) 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, 4758 + ... + 4763.

It is an arithmetic number, because the mean of its divisors is an integer number (9522).

2²⁸⁵⁶³ is an apocalyptic number.

28563 is a deficient number, since it is larger than the sum of its proper divisors (9525).

28563 is an equidigital number, since it uses as much as digits as its factorization.

28563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9524.

The product of its digits is 1440, while the sum is 24.

The square root of 28563 is about 169.0059170562. The cubic root of 28563 is about 30.5680644223.

Adding to 28563 its product of digits (1440), we get a palindrome (30003).

It can be divided in two parts, 285 and 63, that multiplied together give a triangular number (17955 = T₁₈₉).

The spelling of 28563 in words is "twenty-eight thousand, five hundred sixty-three".