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What is the greatest number of 6 digits divisible by 24, 15, and 36?

Published in Number Theory 1 min read

The greatest 6-digit number divisible by 24, 15, and 36 is 999720.

To find this, we need to determine the least common multiple (LCM) of the given numbers, then find the largest 6-digit number divisible by that LCM. Let's break this down:

Finding the LCM

First, we need to find the prime factorization of each number:

  • 24 = 23 * 3
  • 15 = 3 * 5
  • 36 = 22 * 32

The LCM is found by taking the highest power of each prime factor present in the numbers:

LCM (24, 15, 36) = 23 32 5 = 8 9 5 = 360.

So, we need to find the largest 6-digit number divisible by 360.

Finding the Largest 6-digit Number Divisible by the LCM

The largest 6-digit number is 999,999. Now we need to divide this by 360 to see how many times it goes in completely:

999,999 / 360 = 2777.775

This means that 360 goes into 999,999 about 2777 times completely. So let's find that whole number:

2777 * 360 = 999720

This result, 999,720, is the largest 6-digit number divisible by 360 which is the LCM of 24, 15 and 36.

Final Answer

Therefore, the greatest 6-digit number divisible by 24, 15, and 36 is 999720, which is consistent with the provided reference:

∴ 999720 is the greatest number 6-digit number divisible by 24,15 and 36.

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