➗ Math
Prime Factorization Calculator
Every whole number above 1 has exactly one prime factorisation, which is why primes are the building blocks of arithmetic. Trial division by progressively larger primes is all that is needed — and it only has to run up to the square root, because any remaining factor past that point must itself be prime.
How it works
Number to factorise
Prime factorisation
Prime factors with multiplicity
Distinct primes
Total divisors
Sum of divisors
Frequently asked questions
How do I use the Prime Factorization Calculator?
Fill in the fields above — the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.