Significant digits of number not expressed in fixed point notation

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Currently I am working with significant digits of number. I know to find those digits if we have number with fixed decimal point, but, for example numbers $93487$ and $363042$ do not have point. So I am not sure how to find significant digits of number not expressed with fixed point notation. Also, my another question is how to approximate these numbers with numbers that have for example $4$ significant digits. Any help is appreciated.