396510
the largest five digit number that can be formed using the digits 7 and 9 is 97,000
501396
976542
6,543,210
You get the largest number if you sort the digits, from largest to smallest.
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.
The largest ten digit number with no repeated digits is '9876543210'.
501396
499999
976542
6,543,210