You get the largest number if you sort the digits, from largest to smallest.
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279,999,720
100000 of course. If digits have to be different then 123456.
The largest number with no repeated digits is 9,876,543,210 although it is 10 digits long, the largest 3 digit number with no repeated digits is 987
The largest digits number with only 2 digits alike is 99
The largest ten digit number with no repeated digits is '9876543210'.