Using only the digits and the basic operators of arithmetic, 71.
If other operators are allowed then 71! = 8.5*10101 approx, or 85 googol is one possible answer.
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9876 is the largest four digit number you can make if all the digits must be different.
Oh, dude, the biggest number you can make using the digits 9, 5, and 1 is 951. I mean, unless you want to get all fancy and start multiplying or something, but like, who has time for that? Just stick with 951 and call it a day.
The largest numeral that can be formed using all 10 digits is 9876543210. This number contains all the digits from 0 to 9 in descending order, making it the largest possible arrangement. Any other arrangement would result in a smaller number.
1023456789
All five digits in the number are significant.