Divisor 28089

To determine if any number is divisible by 28089, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 9 and 3121 - then it is divisible by 28089.

The following tests must pass:

• Test if a number is divisible by 9
• The "Ondra Hermanek Test" for Divisibility by 3121

Easy!