28393 has 2 divisors, whose sum is σ = 28394. Its totient is φ = 28392.

The previous prime is 28387. The next prime is 28403. The reversal of 28393 is 39382.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28224 + 169 = 168^2 + 13^2 .

It is a cyclic number.

It is not a de Polignac number, because 28393 - 2¹³ = 20201 is a prime.

It is the 169-th Hogben number.

28393 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (28493) by changing a digit.

It is a nontrivial repunit in base 168.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14196 + 14197.

It is an arithmetic number, because the mean of its divisors is an integer number (14197).

2²⁸³⁹³ is an apocalyptic number.

It is an amenable number.

28393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28393 is an equidigital number, since it uses as much as digits as its factorization.

28393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 28393 is about 168.5022255046. The cubic root of 28393 is about 30.5072991578.

The spelling of 28393 in words is "twenty-eight thousand, three hundred ninety-three".