To any set that contains it!
It belongs to {23.5},
or {23.5, sqrt(2), pi, -3/7},
or all whole numbers between 13 and 53,
or integer multiples of 0.5,
or rational numbers,
or real numbers,
or complex numbers,
etc.
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Irrational numbers.
mixed numbers
composite
Rational positive numbers
Not whole numbers. Yes to real numbers and integers.