28723 has 2 divisors, whose sum is σ = 28724. Its totient is φ = 28722.

The previous prime is 28711. The next prime is 28729. The reversal of 28723 is 32782.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28723 - 2⁹ = 28211 is a prime.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 28694 and 28703.

It is not a weakly prime, because it can be changed into another prime (28729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14361 + 14362.

It is an arithmetic number, because the mean of its divisors is an integer number (14362).

2²⁸⁷²³ is an apocalyptic number.

28723 is a deficient number, since it is larger than the sum of its proper divisors (1).

28723 is an equidigital number, since it uses as much as digits as its factorization.

28723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 22.

The square root of 28723 is about 169.4786122199. The cubic root of 28723 is about 30.6250354019.

The spelling of 28723 in words is "twenty-eight thousand, seven hundred twenty-three".