It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75382 = 2 ⋅37691.
It is a cyclic number.
It is a Duffinian number.
It is a nialpdrome in base 13.
It is a congruent number.
228357 is an apocalyptic number.
It is an amenable number.
28357 is an equidigital number, since it uses as much as digits as its factorization.
28357 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4058.
The square root of 28357 is about 168.3953681073. The cubic root of 28357 is about 30.4944001186.
Adding to 28357 its sum of digits (25), we get a palindrome (28382).
The spelling of 28357 in words is "twenty-eight thousand, three hundred fifty-seven".