Sum of Digits of 687
ANSWER : 21
The sum of the digits in the number 687 is: 6 + 8 + 7 = 21
How to Calculate the Digit Sum of 687?
To find the sum of digits of a number, simply break it into individual digits and add them. For 687:
6 + 8 + 7 = 21
The digits of 687 are: 6, 8, 7.
Their sum is: 21
Step-by-Step Digit Sum of 687
We split the number 687 into its individual digits: 6 + 8 + 7 = 21
Digit Positions in 687
| Position | Digit |
|---|---|
| 1 | 6 |
| 2 | 8 |
| 3 | 7 |
Length of 687
The number 687 has 3 digits.
Is 21 a Prime Number?
No, 21 is not a prime number.
Digit Sums in Other Bases
- Binary: 1010101111 → 7
- Octal: 1257 → 15
- Hexadecimal: 2AF → 27