The number 650
650 is a composite number with 12 divisors. Its prime factorisation is 2 × × 13. Divisors (12): 1, 2, 5, 10, 13, 25, 26, 50, 65, 130, 325, 650.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
650 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
650 is composite. Its prime factorisation is
- 3
The divisors add up to 1302; without 650 itself that is 652, so 650 is abundant (652 is more than 650). Euler's totient φ(650) = 240 numbers up to 650 share no factor with it.
- 4
The digits of 650 add up to 11, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 25 steps to reach 1.
LaTeX source of the formulas on this page
\[ 650 = 2 \times 5^{2} \times 13 \]650 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 1302 |
| Euler totient φ(n) | 240 |
| Square | 422500 |
| Cube | 274625000 |
| Square root | 25.495098 (= 5√26) |
| Digit sum / digital root | 11 / 2 |
| Collatz steps to 1 | 25 |
| Scientific notation | 6.5 × |
650 in other forms
| Form | Value |
|---|---|
| In words | six hundred and fifty |
| Roman numerals | DCL |
| Binary (base 2) | 1010001010 |
| Octal (base 8) | 1212 |
| Hexadecimal (base 16) | 28A |
| Base 3 | 220002 |
| As time | 650 seconds = 10 min 50 s |
Is 650 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (650 ÷ 2 = 325) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (650 ÷ 5 = 130) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 6) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (650 ÷ 10 = 65) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 650 a prime number?
No. 650 = 2 × × 13, so it is divisible by 2.
What are the factors of 650?
1, 2, 5, 10, 13, 25, 26, 50, 65, 130, 325, 650.
What is 650 in binary?
1010001010 (hexadecimal 28A, octal 1212).
What is the square root of 650?
About 25.4951, exactly 5√26.
What is 650 in Roman numerals?
DCL.
Is 650 divisible by 3?
No. Its digits add up to 11, which is not a multiple of 3.
What is special about the number 650?
It is a composite number with 12 divisors.