Factors - GCD, LCM - Special Numbers

Calculate Greatest Common Divisor (gcd) and Lowest Common Multiple (lcm) and reduce a fraction to lower terms in microseconds!
Discover various Number Qualities in a simple and intuitive way!
1. Achilles Numbers
2. Automorphic Numbers
3. Cube-free Numbers
4. Cullen Numbers
5. Cyclic Numbers
6. Economical Numbers
7. Equidigital Numbers
8. Factorions
9. Fermat Numbers
10. Glitch Primes
11. Harshad Numbers
12. Hoax Numbers
13. Kaprekar Numbers
14. Mersenne Prime Numbers
15. Münchhausen Numbers
16. Narcissistic Numbers
17. Perfect Numbers
18. Plato's Number
19. Prime Numbers
20. Rhonda Numbers
21. Sheldon Numbers
22. Smith Numbers
23. Square Numbers
24. Square-free Numbers
25. Sublime Numbers
26. Sum-Product Numbers
27. Triangular Numbers
28. Trimorphic Numbers
29. Wasteful Numbers
30. Woodall Numbers