It is a happy number.
321328 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
2321328 is an apocalyptic number.
321328 is a gapful number since it is divisible by the number (38) 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 321328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (376960).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
321328 is a wasteful number, since it uses less digits than its factorization.
321328 is an odious number, because the sum of its binary digits is odd.
The square root of 321328 is about 566.8580069118. The cubic root of 321328 is about 68.4935259479.
The spelling of 321328 in words is "three hundred twenty-one thousand, three hundred twenty-eight".