28493 has 2 divisors, whose sum is σ = 28494. Its totient is φ = 28492.

The previous prime is 28477. The next prime is 28499. The reversal of 28493 is 39482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24649 + 3844 = 157^2 + 62^2 .

It is a cyclic number.

It is not a de Polignac number, because 28493 - 2⁴ = 28477 is a prime.

It is a nialpdrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28499) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14246 + 14247.

It is an arithmetic number, because the mean of its divisors is an integer number (14247).

2²⁸⁴⁹³ is an apocalyptic number.

It is an amenable number.

28493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28493 is an equidigital number, since it uses as much as digits as its factorization.

28493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 28493 is about 168.7986966774. The cubic root of 28493 is about 30.5430727095.

The spelling of 28493 in words is "twenty-eight thousand, four hundred ninety-three".