LCM of 689, 421, 644, 391
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 689, 421, 644, 391 with the LCM of Two or More Numbers Calculator. Here we are teaching you two different methods through which you can calculate the LCM of 689, 421, 644, 391. So, keep reading to learn more.
Given numbers are 689,421,644,391
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 689,421,644,391 is 3175675412.
Find LCM of 689,421,644,391 with Prime Factorization
| 23 | 689, 421, 644, 391 |
| 689, 421, 28, 17 |
Multiply the prime numbers at the bottom and the left side.
23 x 689 x 421 x 28 x 17 = 3175675412
Therefore, the lowest common multiple of 689,421,644,391 is 3175675412.
LCM formula is LCM(a1, a2, an) = (a1 x a2 x an)/{GCF(a1 x a2 x an) x common factors}
Firstly, we have to find the product of all the numbers.
689 x 421 x 644 x 391 = 73040534476
Then, let us find the GCF of these five numbers. To do so, we have to list down the factors for each number and choose the highest factor that is in all of the lists.
689 : 1, 13, 53, 689
421 : 1, 421
644 : 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322, 644
391 : 1, 17, 23, 391
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 689,421,644,391, is 1.
Now, the common factors can be found like this.
689:13x 53
421:421
644:2x 2x 7x 23
391:17x 23
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
23 = 23
Therefore, the value for common factors is 23.
Now that we have all the elements of the formula, we can plug them in to calculate the LCM.
LCM(a1, a2, an) = (a1 x a2 x an)/{GCF(a1 x a2 x an) x common factors}
LCM = 73040534476/(1x23)
LCM = 73040534476/23
LCM = 3175675412
Thus, we can understand that the LCM of 689,421,644,391 is 3175675412.
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FAQs on LCM of 689, 421, 644, 391
1. What is the LCM of 689, 421, 644, 391?
Answer: LCM of 689, 421, 644, 391 is 3175675412.
2. How to calculate the LCM of 689, 421, 644, 391?
The LCM can be found using two methods. You can either use the LCM formula or the prime factorization method to calculate the LCM of 689, 421, 644, 391.
3. What is the LCM formula?
The LCM formula is LCM(a1, a2, an) = (a1 x a2 x an)/{GCF(a1 x a2 x an) x common factors}.