28663 has 2 divisors, whose sum is σ = 28664. Its totient is φ = 28662.

The previous prime is 28661. The next prime is 28669. The reversal of 28663 is 36682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28663 - 2¹ = 28661 is a prime.

Together with 28661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14331 + 14332.

It is an arithmetic number, because the mean of its divisors is an integer number (14332).

2²⁸⁶⁶³ is an apocalyptic number.

28663 is a deficient number, since it is larger than the sum of its proper divisors (1).

28663 is an equidigital number, since it uses as much as digits as its factorization.

28663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 28663 is about 169.3015061953. The cubic root of 28663 is about 30.6036961375.

The spelling of 28663 in words is "twenty-eight thousand, six hundred sixty-three".