It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 40664.
It is an unprimeable number.
240664 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 40664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45360).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
40664 is a wasteful number, since it uses less digits than its factorization.
40664 is an odious number, because the sum of its binary digits is odd.
The square root of 40664 is about 201.6531675923. The cubic root of 40664 is about 34.3877187095.
The spelling of 40664 in words is "forty thousand, six hundred sixty-four".