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Assuming you mean exactly 8, any that are composed of:

  1. Three different prime numbers, eg 30 = 2 x 3 x 5, 42 = 2 x 3 x 7, 409457 = 71 x 73 x 79
  2. Two different primes, one cubed (to the power 3), eg 24 = 23 x 3, 56 = 23 x 7, 1102267 = 313 x 37
  3. One prime to the power 7, eg 128 = 27, 2187 = 37, 893871739 = 197

A number having more than 8 factors also has 8 factors (plus some). eg 36 has 8 factors (plus another 1), 90 has 8 factors (plus another 4)

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11y ago
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5y ago

Any number with three distinct prime factors has eight factors in total.

2 x 3 x 5 = 30

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14y ago

There are an infinite number of such numbers: the smallest is 24 (1, 2, 3, 4, 6, 8, 12, 24).

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10y ago

The smallest one is 24.

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13y ago

1,2,4,7,14,28

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11y ago

The factors of 8 are 1, 2, 4, and 8.

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7y ago

It is: 1+2+4+8 = 15

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11y ago

24

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Q: What number are factors of 8?
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