Divisor 28093

To determine if any number is divisible by 28093, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 13 and 2161 - then it is divisible by 28093.

The following tests must pass:

• Test if a number is divisible by 13
• The "Michael Grace Test" for Divisibility by 2161

Easy!