Write all factors of the following number:

$729$

Write first five multiples of the following number:

$25$

Write first five multiples of the following number:

$35$

Write first five multiples of the following number:

$45$

Write first five multiples of the following number:

$40$

Check whether the given number is a factor of $15$.

$15615$

Check whether the given number is a factor of $15$.

$123015$

Check whether the given number is divisible by $21$.

$21063$

Check whether the following number is divisible by $21$.

$20163$