LCM of 721, 578, 728, 221
Reviewed By : Rajashekhar Valipishetty
Last Updated at : Mar 29,2023
Find the LCM of 721, 578, 728, 221 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 721, 578, 728, 221. So, keep reading to learn more.
Given numbers are 721,578,728,221
The least common multiple of numbers can be find using the prime factorization method or LCM formula.
The LCM of 721,578,728,221 is 21670376.
Find LCM of 721,578,728,221 with Prime Factorization
| 2 | 721, 578, 728, 221 |
| 7 | 721, 289, 364, 221 |
| 13 | 103, 289, 52, 221 |
| 17 | 103, 289, 4, 17 |
| 103, 1, 4, 17 |
Multiply the prime numbers at the bottom and the left side.
2 x 7 x 13 x 17 x 103 x 1 x 4 x 17 = 21670376
Therefore, the lowest common multiple of 721,578,728,221 is 21670376.
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.
721 x 578 x 728 x 221 = 67048143344
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.
721 : 1, 7, 103, 721
578 : 1, 2, 17, 34, 289, 578
728 : 1, 2, 4, 7, 8, 13, 14, 26, 28, 52, 56, 91, 104, 182, 364, 728
221 : 1, 13, 17, 221
1 is the greatest number that appears in all the lists. Therefore, we can determine that the GCF of 721,578,728,221, is 1.
Now, the common factors can be found like this.
721:7x 103
578:2x 17x 17
728:2x 2x 2x 7x 13
221:13x 17
From this, we can see that the common factors because they appear for more than two numbers. So, just multiply them all together.
2x 7x 13x 17 = 3094
Therefore, the value for common factors is 3094.
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 = 67048143344/(1x3094)
LCM = 67048143344/3094
LCM = 21670376
Thus, we can understand that the LCM of 721,578,728,221 is 21670376.
LCM of two or more Numbers Calculation Examples
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FAQs on LCM of 721, 578, 728, 221
1. What is the LCM of 721, 578, 728, 221?
Answer: LCM of 721, 578, 728, 221 is 21670376.
2. How to calculate the LCM of 721, 578, 728, 221?
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 721, 578, 728, 221.
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}.