Adding to 28013 its reverse (31082), we get a palindrome (59095).
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31082 = 2 ⋅15541.
It is a cyclic number.
It is a Duffinian number.
28013 is an undulating number in base 16.
It is a plaindrome in base 7.
It is a nialpdrome in base 8.
It is a zygodrome in base 8.
It is a congruent number.
228013 is an apocalyptic number.
It is an amenable number.
28013 is a wasteful number, since it uses less digits than its factorization.
28013 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 366.
The square root of 28013 is about 167.3708457289. The cubic root of 28013 is about 30.3705884746.
The spelling of 28013 in words is "twenty-eight thousand, thirteen".