28623 has 16 divisors (see below), whose sum is σ = 46080.
Its totient is φ = 15456.
The previous prime is 28621. The next prime is 28627. The reversal of 28623 is 32682.
It is not a de Polignac number, because 28623 - 21 = 28621 is a prime.
It is a super-2 number, since 2×286232 = 1638552258, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (21).
It is a nialpdrome in base 15.
It is a self number, because there is not a number n which added to its sum of digits gives 28623.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (28621) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 586 + ... + 632.
It is an arithmetic number, because the mean of its divisors is an integer number (2880).
228623 is an apocalyptic number.
28623 is a deficient number, since it is larger than the sum of its proper divisors (17457).
28623 is a wasteful number, since it uses less digits than its factorization.
28623 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 86.
The product of its digits is 576, while the sum is 21.
The square root of 28623 is about 169.1833325124.
The cubic root of 28623 is about 30.5894534119.
The spelling of 28623 in words is "twenty-eight thousand, six hundred twenty-three".