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The numeral 251770000 is usually indicated as 251,770,000 in the US. This is spelled out as "251 million, seven hundred and seventy thousand." The standard notation would be 2.5177 x 108.
729 = 36 or 5314410.5 are two possible ways.
3^4 or 9^2
There are lots of different ways. One is to represent them as points in space of two or more dimensions.
name with a uppercase letterbracesfor example, E = {2,4,6,8}