LCM of 390, 672, 861, 920, 781
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 390, 672, 861, 920, 781 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 390, 672, 861, 920, 781. So, keep reading to learn more.
Given numbers are 390,672,861,920,781
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 390,672,861,920,781 is 32169577440.
Find LCM of 390,672,861,920,781 with Prime Factorization
| 2 | 390, 672, 861, 920, 781 |
| 2 | 195, 336, 861, 460, 781 |
| 2 | 195, 168, 861, 230, 781 |
| 3 | 195, 84, 861, 115, 781 |
| 5 | 65, 28, 287, 115, 781 |
| 7 | 13, 28, 287, 23, 781 |
| 13, 4, 41, 23, 781 |
Multiply the prime numbers at the bottom and the left side.
2 x 2 x 2 x 3 x 5 x 7 x 13 x 4 x 41 x 23 x 781 = 32169577440
Therefore, the lowest common multiple of 390,672,861,920,781 is 32169577440.
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.
390 x 672 x 861 x 920 x 781 = 162134670297600
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.
390 : 1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390
672 : 1, 2, 3, 4, 6, 7, 8, 12, 14, 16, 21, 24, 28, 32, 42, 48, 56, 84, 96, 112, 168, 224, 336, 672
861 : 1, 3, 7, 21, 41, 123, 287, 861
920 : 1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 115, 184, 230, 460, 920
781 : 1, 11, 71, 781
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 390,672,861,920,781, is 1.
Now, the common factors can be found like this.
390:2x 3x 5x 13
672:2x 2x 2x 2x 2x 3x 7
861:3x 7x 41
920:2x 2x 2x 5x 23
781:11x 71
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 3x 3x 5x 7 = 5040
Therefore, the value for common factors is 5040.
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 = 162134670297600/(1x5040)
LCM = 162134670297600/5040
LCM = 32169577440
Thus, we can understand that the LCM of 390,672,861,920,781 is 32169577440.
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FAQs on LCM of 390, 672, 861, 920, 781
1. What is the LCM of 390, 672, 861, 920, 781?
Answer: LCM of 390, 672, 861, 920, 781 is 32169577440.
2. How to calculate the LCM of 390, 672, 861, 920, 781?
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 390, 672, 861, 920, 781.
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}.