There is no highest number
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There is an infinite number of possibilities to the highest number.
I suppose you mean, the biggest finite number. There is none; you can always add one more, to get an even bigger number. Nor is there a biggest infinite number, for that matter. If you raise two to an infinite power, you get a bigger infinity.
It is infinite
Unfortunately, we cannot calculate the Highest Common Multiple of numbers due to the fact that there are an infinite number of multiples of 48 and 72.
There will be 1 circle, 1 square, an infinite number of ellipses, an infinite number of rectangles, an infinite number of other quadrilaterals, an infinite number of polygons with 5 or more sides, an infinite number of odd shapes. In all, a lot.