144 is a number that is divisible by the value of its φ function, which returns 48 in this case. Also, there are 21 solutions to the equation φ(x) = 144, more than any integer below 144, making it a highly totient number
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All the multiples of 24 are divisible by 24. These include 24, 48, 72, 96, 120, 144, 168, 192, and 216
Every number is divisible by any non-zero number. 527 is not evenly divisible by 3.
Every number is divisible by any non-zero number. However, 1023 is not evenly divisible by 2.
There is no number, no matter the number of digits, that is only divisible by 2.
It's very easy to test a number to see if it is divisible by 4 or by 9. If it passes both tests, then it is divisible by 4x9=36.To test for divisibility by 9, add the digits of the number. If the sum is divisible by 9, then the number is divisible by 9.To test for divisibility by 4, look at the last two digits. If they are a multiple of 4, then the number is divisible by 4.