How many 6 digit positive integers satisfy the condition that when I write the number upside down in digital format, it increases in value by 520044?
Details and Assumptions:
- All digits look like this in digital format:
Clarification: These numbers can't consist of digits 3, 4, or 7 because they are not readable when written upside down.
As an explicit example, when the number 120586 is written upside down, the number becomes 985021 so it increases in value by 864435.