What is the greatest number possible with 8 in ten thousands place?

Answer 1

There cannot be a greatest number.

For example, 5687480000 has 8 in the ten thousands place.

But so does 1000000000005687480000 and it is bigger.

And 2000000000005687480000 is bigger still.

Answer 2

Unless you specify the total number of digits, someone will just surround that eight with nines as far as the eye can see.

Answer 3

81000