It belongs to the set consisting of -64, the set consisting of minus (powers of 2), the set of minus (multiples of 2), the set {2, 3.78, sqrt(99), -64}
In fact, it belongs to any set that contains it. And there are infinitely many such sets.
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Irrational numbers.
mixed numbers
composite
Rational positive numbers
Not whole numbers. Yes to real numbers and integers.