Finding the factors of a large number has a reputation as an extraordinarily difficult math problem. This simple calculator will instantly factor numbers and find primes. You can factor small numbers or large numbers up to 4,000,000,009 instantly (4+ billion).
+Clean, simple interface
+Easy to use
+Number range: 1 - 4,000,000,009
+Find factors and prime numbers
+Large and small whole numbers
Version 5: Completely re-wrote interface for speed and simplicity. Will now factor numbers up to 4,000,000,009!