[PHP] divide

[phpu]

Hello,
I'm new in php and i've got allready a problem.
I wanna divide 2 numbers and the result to be an integer separated by comma. For 
example:
$number1=10000000;
$number2=17;
$result=$number1 / $number2;
In this case the result is 588235.29411764....
And I wanna the result to be like this 588,235

thanks