28307 has 2 divisors, whose sum is σ = 28308. Its totient is φ = 28306.

The previous prime is 28297. The next prime is 28309. The reversal of 28307 is 70382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28307 - 2⁸ = 28051 is a prime.

Together with 28309, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 12.

It is a nialpdrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28307.

It is not a weakly prime, because it can be changed into another prime (28309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14153 + 14154.

It is an arithmetic number, because the mean of its divisors is an integer number (14154).

2²⁸³⁰⁷ is an apocalyptic number.

28307 is a deficient number, since it is larger than the sum of its proper divisors (1).

28307 is an equidigital number, since it uses as much as digits as its factorization.

28307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 28307 is about 168.2468424667. The cubic root of 28307 is about 30.4764666626.

Adding to 28307 its reverse (70382), we get a palindrome (98689).

The spelling of 28307 in words is "twenty-eight thousand, three hundred seven".