28099 has 2 divisors, whose sum is σ = 28100. Its totient is φ = 28098.

The previous prime is 28097. The next prime is 28109. The reversal of 28099 is 99082.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28099 - 2¹ = 28097 is a prime.

Together with 28097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14049 + 14050.

It is an arithmetic number, because the mean of its divisors is an integer number (14050).

2²⁸⁰⁹⁹ is an apocalyptic number.

28099 is a deficient number, since it is larger than the sum of its proper divisors (1).

28099 is an equidigital number, since it uses as much as digits as its factorization.

28099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 28099 is about 167.6275633659. The cubic root of 28099 is about 30.4016359923.

It can be divided in two parts, 2809 and 9, that multiplied together give a square (25281 = 159²).

The spelling of 28099 in words is "twenty-eight thousand, ninety-nine".