28319 has 2 divisors, whose sum is σ = 28320. Its totient is φ = 28318.

The previous prime is 28309. The next prime is 28349. The reversal of 28319 is 91382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28319 - 2¹² = 24223 is a prime.

It is a super-2 number, since 2×28319² = 1603931522, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 12.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 28294 and 28303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28309) 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, 14159 + 14160.

It is an arithmetic number, because the mean of its divisors is an integer number (14160).

2²⁸³¹⁹ is an apocalyptic number.

28319 is a deficient number, since it is larger than the sum of its proper divisors (1).

28319 is an equidigital number, since it uses as much as digits as its factorization.

28319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 28319 is about 168.2825005757. The cubic root of 28319 is about 30.4807726168.

The spelling of 28319 in words is "twenty-eight thousand, three hundred nineteen".