-4790281
9876543210
8,754,321
999
8643
531
the largest five digit number that can be formed using the digits 7 and 9 is 97,000
There are 3,265,920 numbers that can be formed using all the digits. The answer to the question will depend on which one of these.
102345
9531
1023459
The biggest 4 digit number that can be made from using the digits of 850236, using a digit at most once, is 8653.