28820 divided by its sum of digits (20) gives a palindrome (1441).
It is a congruent number.
It is an unprimeable number.
228820 is an apocalyptic number.
28820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 28820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33264).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
28820 is a wasteful number, since it uses less digits than its factorization.
28820 is an evil number, because the sum of its binary digits is even.
The square root of 28820 is about 169.7645428233. The cubic root of 28820 is about 30.6594711116.
The spelling of 28820 in words is "twenty-eight thousand, eight hundred twenty".