The number 67
67 is the 19th prime number. Its only divisors are 1 and 67.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 67: the 19th prime number.
- 2
67 is prime, so its only factors are 1 and 67. It is the 19th prime; the next prime is 71 and the one before is 61.
- 3
The divisors add up to 68; without 67 itself that is 1, so 67 is deficient (1 is less than 67). Euler's totient φ(67) = 66 numbers up to 67 share no factor with it.
- 4
The digits of 67 add up to 13, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 27 steps to reach 1.
67 at a glance
| Property | Value |
|---|---|
| Type | prime |
| Number of divisors | 2 |
| Sum of divisors | 68 |
| Euler totient φ(n) | 66 |
| Square | 4489 |
| Cube | 300763 |
| Square root | 8.185353 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 27 |
| Scientific notation | 6.7 × |
67 in other forms
| Form | Value |
|---|---|
| In words | sixty-seven |
| Roman numerals | LXVII |
| Binary (base 2) | 1000011 |
| Octal (base 8) | 103 |
| Hexadecimal (base 16) | 43 |
| Base 3 | 2111 |
| As time | 67 seconds = 1 min 7 s |
Is 67 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | 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 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 67 a prime number?
Yes. 67 is divisible only by 1 and itself.
What are the factors of 67?
1, 67.
What is 67 in binary?
1000011 (hexadecimal 43, octal 103).
What is the square root of 67?
About 8.1854.
What is 67 in Roman numerals?
LXVII.
Is 67 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 67?
67 is the 19th prime number.