LCM of 978, 809, 798, 861, 391
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 978, 809, 798, 861, 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 978, 809, 798, 861, 391. So, keep reading to learn more.
Given numbers are 978,809,798,861,391
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 978,809,798,861,391 is 1686939981846.
Find LCM of 978,809,798,861,391 with Prime Factorization
| 2 | 978, 809, 798, 861, 391 |
| 3 | 489, 809, 399, 861, 391 |
| 7 | 163, 809, 133, 287, 391 |
| 163, 809, 19, 41, 391 |
Multiply the prime numbers at the bottom and the left side.
2 x 3 x 7 x 163 x 809 x 19 x 41 x 391 = 1686939981846
Therefore, the lowest common multiple of 978,809,798,861,391 is 1686939981846.
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.
978 x 809 x 798 x 861 x 391 = 212554437712596
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.
978 : 1, 2, 3, 6, 163, 326, 489, 978
809 : 1, 809
798 : 1, 2, 3, 6, 7, 14, 19, 21, 38, 42, 57, 114, 133, 266, 399, 798
861 : 1, 3, 7, 21, 41, 123, 287, 861
391 : 1, 17, 23, 391
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 978,809,798,861,391, is 1.
Now, the common factors can be found like this.
978:2x 3x 163
809:809
798:2x 3x 7x 19
861:3x 7x 41
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.
2x 3x 3x 7 = 126
Therefore, the value for common factors is 126.
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 = 212554437712596/(1x126)
LCM = 212554437712596/126
LCM = 1686939981846
Thus, we can understand that the LCM of 978,809,798,861,391 is 1686939981846.
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FAQs on LCM of 978, 809, 798, 861, 391
1. What is the LCM of 978, 809, 798, 861, 391?
Answer: LCM of 978, 809, 798, 861, 391 is 1686939981846.
2. How to calculate the LCM of 978, 809, 798, 861, 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 978, 809, 798, 861, 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}.