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The factors of 511 are the numbers that can be multiplied together to give 511. The factors of 511 are 1, 7, 73, and 511. Prime factors are the factors that are prime numbers. The prime factors of 511 are 7 and 73, as they are the prime numbers that can be multiplied together to give 511.
The factors of 21 are 1, 3, 7, and 21. The factors of 49 are 1, 7, and 49.
The factors of 7 are the numbers that can be multiplied together to result in 7. In this case, the factors of 7 are 1 and 7, as 1 x 7 = 7. Since 7 is a prime number, it only has two factors, which are 1 and 7.
2 and 3 and 7
It's not entirely clear from the wording of your question what it is you want to know. Seven is a one-digit number. The sum of its digits is 7. Seven has two factors: 1 and 7. That sum is 8.