6.00
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539 can be divided by 1, 7, 11, 13, 77, 91, and 539 itself. These are the factors of 539, which are numbers that can be multiplied to give the original number.
When rounding off, the rule is, "If the first figure to be discarded is 5 or more then the previous figure is increased by 1. Following this rule then 650 is the result of rounding off numbers in the range 645 to 654. As 650 itself is not rounded off then there are 9 whole numbers that can be rounded to 650.
6500 to 7499 -- 1000 numbers
The answer is 500
500