985
As a string, the largest number is 7111111.
986541
9650 is the largest formed by re-ordering the digits.
86420
the largest five digit number that can be formed using the digits 7 and 9 is 97,000
99997
Without using exponents or factorials, that's it.
976542
The largest ten digit number with no repeated digits is '9876543210'.
651
6,543,210
You get the largest number if you sort the digits, from largest to smallest.