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By rearranging the digits, it is 9861.
4^5827 which is approximately 1.597973114x103508
97632 is the largest number containing these digits. To make the largest number simply order the numbers in descending order. As it happens this results in an even number so nothing further is necessary.
9876 is the largest four digit number you can make if all the digits must be different.
Using the digits, we can make 81 x 62 equals 5022, which is the largest possible product. To make the smallest possible product, do 268 x 1 = 268.