Divisor 28311

To determine if any number is divisible by 28311, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 9437 - then it is divisible by 28311.

The following tests must pass:

• Test if a number is divisible by 3
• The "Helen Garfinkle Test" for Divisibility by 9437

Easy!