Divisor 28399

To determine if any number is divisible by 28399, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 7 and 4057 - then it is divisible by 28399.

The following tests must pass:

• Test if a number is divisible by 7
• The "Shayne Plourde Test" for Divisibility by 4057

Easy!