What is the greatest six digit even number that matches all of the clues

The ten thousands digit is twice the tens digit
The hundred thousands digit is more than six
The thousands digit can be divided by the ones digit
No digit is used more than once

2 answers

The hundred thousands digit is more than six
XX7XX XX8XX XX9XX

The thousands digit can be divided by the ones digit
and since the number is even, the ones digit is even
X47X2 X87X4
X48X2 X88X2 , but all digits are different, so skip the last, so X48X2
X49X2 X89X4

The ten thousands digit is twice the tens digit
64732 68734 64832 64932 68934

these 5 match your conditions, but the largest is
68934
5+2x=8