LCM of 720, 638, 649, 392
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 720, 638, 649, 392 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 720, 638, 649, 392. So, keep reading to learn more.
Given numbers are 720,638,649,392
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 720,638,649,392 is 664004880.
Find LCM of 720,638,649,392 with Prime Factorization
| 2 | 720, 638, 649, 392 |
| 2 | 360, 319, 649, 196 |
| 2 | 180, 319, 649, 98 |
| 11 | 90, 319, 649, 49 |
| 90, 29, 59, 49 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 11 x 90 x 29 x 59 x 49 = 664004880
Therefore, the lowest common multiple of 720,638,649,392 is 664004880.
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.
720 x 638 x 649 x 392 = 116864858880
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.
720 : 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720
638 : 1, 2, 11, 22, 29, 58, 319, 638
649 : 1, 11, 59, 649
392 : 1, 2, 4, 7, 8, 14, 28, 49, 56, 98, 196, 392
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 720,638,649,392, is 1.
Now, the common factors can be found like this.
720:2x 2x 2x 2x 3x 3x 5
638:2x 11x 29
649:11x 59
392:2x 2x 2x 7x 7
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
2x 2x 2x 2x 11 = 176
Therefore, the value for common factors is 176.
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 = 116864858880/(1x176)
LCM = 116864858880/176
LCM = 664004880
Thus, we can understand that the LCM of 720,638,649,392 is 664004880.
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FAQs on LCM of 720, 638, 649, 392
1. What is the LCM of 720, 638, 649, 392?
Answer: LCM of 720, 638, 649, 392 is 664004880.
2. How to calculate the LCM of 720, 638, 649, 392?
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 720, 638, 649, 392.
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}.