Prime numbers like 2, 3, 5 and 7
2 x 3 x 5 x 7 = 210
7 is a prime number, so its factors are 1 and 7.8 has factors of 1 , 2 , 4 , 8.You can check for factors by dividing the number by every integer (or whole number) between the number and zero. Every number that divides without leaving a remainder is a factor.
64, 729, 15625 and so on. Prime numbers to the 6th power.
9
A number that has exactly two (positive) factors is called a prime number. For instance, the only factors of 7 are 1 and 7.
729 is the second number with exactly 7.
There are an infinite number of integers with "only 7 factors". Any number which is the product of exactly 7 prime numbers.
510510
64 is the least number having exactly 7 factors: 1, 2, 4, 8, 16, 32, and 64.
All prime squares have exactly three factors.49 has exactly three factors: 1, 7, and 49.
510510
Any number that is the 6th power of a prime integer.
Their common factors are 1 and 7 .
It is 2^6 = 64.
64
3*5*7*9 = 945 ...check if any number less than that has exactly four distinct factors.