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Oh, dude, you're hitting me with some math vibes here. So, like, the number that has exactly 7 factors is 48. It's like, 1, 2, 3, 4, 6, 8, and 12 can all divide into 48. So, yeah, 48 is your lucky number with 7 factors.
The number that has exactly 7 factors is a square of a Prime number. In general, a number with an odd number of factors must be a perfect square. This is because factors come in pairs, except when the number is a perfect square, where the square root is counted only once. Therefore, the only number with exactly 7 factors is the square of a prime number.
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All prime squares have exactly three factors.49 has exactly three factors: 1, 7, and 49.
A prime number has exactly two factors.
The number that has exactly 15 factors is 28. To determine the number of factors a number has, you can prime factorize the number and then add 1 to each exponent in the prime factorization and multiply these numbers together. In the case of 28, the prime factorization is 2^2 * 7^1, so the number of factors is (2+1) * (1+1) = 3 * 2 = 6. To have exactly 15 factors, the number needs to be a square of a prime number, so 28 = 2^2 * 7^1 fits this criteria.
A number has exactly three factors if and only if it is the square of a prime number.