CNET Editors' review
Factorizer is an easy-to-use program that finds factors, primes, prime decompositions, and pairs of primes. The program's simple design and quick results make it a great option for users doing this kind of math.
Factorizer's interface is not beautiful, but it is clean and intuitive, with all of its functions clearly displayed on one screen. You enter a number or range of numbers and then simply click a radio button to select factors, prime numbers, prime pairs, etc. The results are displayed in a text box from which you can easily cut and paste the data into another application. In addition to these basic functions, Factorizer offers graphs that plot integers with prime factors of n, EK values, and Palmen color frequencies. You can also set a filter condition to restrict the numbers considered by the program to positive integers in a particular sequence. All of these features were easy to use and produced quick results. The program comes with a brief built-in Help file, but all of the program's features are explained in a well-written online user guide that includes examples and screenshots.
Factorizer has a free trial that doesn't expire, but it factors numbers only up to 2000 and images of histograms cannot be saved. The program comes as a zip file and installs and uninstalls without issues. We recommend this program to anyone who needs a quick and reliable way to find factors or prime numbers.
Publisher's Description
From Hermetic Systems:
Factorizer is a Windows program to find factors of numbers up to 2,147,483,646 and to find primes, pairs of primes and Palmen colors of numbers. Or in more detail, Factorizer may be used to get the prime decomposition of all numbers in a range of numbers, to get all factors of a single number or all factors of all numbers in a range, to find only the prime numbers in a range of numbers, to find pairs of prime numbers (e.g. 107 and 109) in a certain range, to count (without displaying) the prime numbers in a range of numbers, to find Fermat and Mersenne primes less than 2,147,483,647, and to find the Palmen color of a number or the colors of a range of numbers.
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"It works as good as the free ones."
Version: Factorizer 10.11
Pros
IF you need a program to factor number UNDER 2.1 billion that is what it does.
Cons
This is such a common task, there are places on-line that do the same thing for free.
Summary
Limited use for the money. Type in prime factoring into any search engine and you can fine many online programs that will do the same thing for free.
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