28123 has 2 divisors, whose sum is σ = 28124. Its totient is φ = 28122.

The previous prime is 28111. The next prime is 28151. The reversal of 28123 is 32182.

It is a happy number.

28123 is nontrivially palindromic in base 2.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28123 - 2⁹ = 27611 is a prime.

28123 is a lucky number.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 28097 and 28106.

It is not a weakly prime, because it can be changed into another prime (28163) 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, 14061 + 14062.

It is an arithmetic number, because the mean of its divisors is an integer number (14062).

2²⁸¹²³ is an apocalyptic number.

28123 is a deficient number, since it is larger than the sum of its proper divisors (1).

28123 is an equidigital number, since it uses as much as digits as its factorization.

28123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 16.

The square root of 28123 is about 167.6991353585. The cubic root of 28123 is about 30.4102891072.

It can be divided in two parts, 28 and 123, that added together give a palindrome (151).

The spelling of 28123 in words is "twenty-eight thousand, one hundred twenty-three".