As a string, the largest number is 7111111.
986541
9650 is the largest formed by re-ordering the digits.
To form the largest odd number less than 500,000 using the digits 5, 6, 0, 1, 3, and 9 each only once, we need to ensure the number is odd, which means it must end in 1, 3, or 9. The largest possible arrangement of the remaining digits while keeping the number under 500,000 is 39651. Therefore, the largest odd number less than 500,000 that can be formed is 39651.
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'.
976542
651
6,543,210
You get the largest number if you sort the digits, from largest to smallest.