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45 = 3 x 3 x 5 or 32 x 5
180 = 2 x 2 x 3 x 3 x 5 or 22 x 32 x 5
720 = 24 x 32 x 5
28 + 29 + 31 + 32 2 x 3 x 4 x 5
There are infinitely many pairs. Suppose x is any non-zero number. Let y = 32/x. Then x*y = x*(32/x) = 32 Then there are infinitely many sets of 3 numbers, of 4 numbers, etc.