The key to solving this kind of problem is to use the largest digit you possibly can, starting at the left. For example, the largest even digit is 8, so you start with an 8. For the next digit - the second from left - you can't repeat the 8, nor any odd digit, so you need to use the next-largest even digit.
98765
86420
976542
The number is 9875.
Is the answer not: 9876543210? Best regards, OO
9876543210, without using any mathemeatical operations.
975
96425 Larger numbers can be made by cascading the powers, but not on here because the notation won't take it.
99,999ninety-nine thousand, nine hundred and ninety-nine
I think the answer is: 976542
1023459
102345