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Q: What is the least number with exactly 8 factors?

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64 is the least number having exactly 7 factors: 1, 2, 4, 8, 16, 32, and 64.

8

8

8 (1,2,4,8)

8

There is no such number. Any prime number raised to the third power has exactly four factors. For example, 23 = 8; its factors are 1, 2, 4, 8 (1, 2, 22, 23). Since - as is well-known - there is no largest prime number, there is no largest number that has exactly four factors.

24

88 has exactly eight factors (1, 2, 4, 8, 11, 22, 44 & 88)

Answer16 is the smallest natural number that has exactly five factors; which are: 1, 2, 4, 8, and 16. Only squares have an odd number of factors.

8, 2*2*2

There are quite a few. 6 does. 8 does.

There are an infinite number of them. 8 has three prime factors, 30 is the first with three distinct prime factors.

Indeed, the number 16 has 5 factors, 1, 2, 4, 8, and 16.

A number that has exactly an odd number of factors is a power of another number. A number between 10 and 30 that is a power is 16. It is 24 (as well as 42) and its factors are 1, 2, 4, 8, and 16.

It is 30.

The least common multiple of 16 and 8 is 16. Because 16 is a multiple of 8, it is automatically the LCM of the pair. Another approach: To find the least common multiple, factor each number to its prime factors and then multiply all the factors from the first number with any factors in the second number that are not repeated from the first number. The prime factors of 8 are 2 x 2 x 2. The prime factors of 16 are 2 x 2 x 2 x 2.

30 has exactly 8 factors 1,2,3,5,6,10,15,30

16 with the factors 1, 2, 4, 8, 16

8

the number 105 does - 1, 3, 5, 7, 15, 21, 35, 105

16 (1, 2, 4, 8, and 16) and 81 (1, 3, 9, 27, and 81) each have exactly five factors.

13 is a prime number. It and 8 have no factors in common. Therefore, the least common multiple is 8 x 13 = 104.

30

Yes. 16, 8, 4, 2, 1

30