28685999 has 2 divisors, whose sum is σ = 28686000. Its totient is φ = 28685998.

The previous prime is 28685981. The next prime is 28686001. The reversal of 28685999 is 99958682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28685999 - 2⁸ = 28685743 is a prime.

Together with 28686001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28685929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14342999 + 14343000.

It is an arithmetic number, because the mean of its divisors is an integer number (14343000).

Almost surely, 2^28685999 is an apocalyptic number.

28685999 is a deficient number, since it is larger than the sum of its proper divisors (1).

28685999 is an equidigital number, since it uses as much as digits as its factorization.

28685999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 56.

The square root of 28685999 is about 5355.9311982138. The cubic root of 28685999 is about 306.1187934968.

The spelling of 28685999 in words is "twenty-eight million, six hundred eighty-five thousand, nine hundred ninety-nine".