It is a tau number, because it is divible by the number of its divisors (36).
It is a congruent number.
2216828 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 216828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289380).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
216828 is a wasteful number, since it uses less digits than its factorization.
216828 is an evil number, because the sum of its binary digits is even.
The square root of 216828 is about 465.6479356767. The cubic root of 216828 is about 60.0765689118.
The spelling of 216828 in words is "two hundred sixteen thousand, eight hundred twenty-eight".