ANSWER 1:

The highest number that can be formed is 511108.

You remove the 2 horizontal sticks on the zero and make it a 1 between them.

Also if you want to see it upside down the maximum number would be 811105.

ANSWER 2:

Or the 2nd possible answer is shown in the picture below;

So were you able to solve the riddle? Leave your answers in the comment section below. If you get the right answer, please do share the riddle with your friends and family.