If you don't want any odd digit, and don't want to repeat a digit, start with the largest possible digit, in this case 8, and keep adding the largest digit every time, until you run out of possibilities: 86420.
86420
976542
98765
975
96425 Larger numbers can be made by cascading the powers, but not on here because the notation won't take it.
I think the answer is: 976542
9876543210, without using any mathemeatical operations.
1023459
99,999ninety-nine thousand, nine hundred and ninety-nine
As a string, the largest number is 7111111.
With repeating digits, there are 33 = 27 possible combinations.Without repeating any digits, there are 6 combinations:357375537573735753
The number is 9875.