The number 31678
31678 is a composite number with 8 divisors. Its prime factorisation is 2 × 47 × 337. Divisors (8): 1, 2, 47, 94, 337, 674, 15839, 31678.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
31678 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31678 is composite. Its prime factorisation is
- 3
The divisors add up to 48672; without 31678 itself that is 16994, so 31678 is deficient (16994 is less than 31678). Euler's totient φ(31678) = 15456 numbers up to 31678 share no factor with it.
- 4
The digits of 31678 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 77 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31678 = 2 \times 47 \times 337 \]
31678 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 48672 |
| Euler totient φ(n) | 15456 |
| Square | 1003495684 |
| Cube | 31788736277752 |
| Square root | 177.983145 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 77 |
| Scientific notation | 3.1678 × |
31678 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand six hundred and seventy-eight |
| Binary (base 2) | 111101110111110 |
| Octal (base 8) | 75676 |
| Hexadecimal (base 16) | 7BBE |
| Base 3 | 1121110021 |
| As time | 31678 seconds = 8 h 47 min 58 s |
Is 31678 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (31678 ÷ 2 = 15839) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | 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 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31678 a prime number?
No. 31678 = 2 × 47 × 337, so it is divisible by 2.
What are the factors of 31678?
1, 2, 47, 94, 337, 674, 15839, 31678.
What is 31678 in binary?
111101110111110 (hexadecimal 7BBE, octal 75676).
What is the square root of 31678?
About 177.9831.
Is 31678 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 31678?
It is a composite number with 8 divisors.