&-operator does not work with big numbers

hello!

i think the &-operator has problems with big numbers!

a example:

/* this works correct */
if((24&8)==8) echo "ok<br>";
else echo "not ok<br>";

result:
"ok";

/* this works wrong */
if((35769305792512&2097152)==2097152) echo "ok<br>";
else echo "not ok<br>";

result: "ok";

here are the numbers in the dual-system:

/* 1000001000100000110000110001000000000000000000
1000000000000000000000 */

Thanks,
Caszt