The number 67381
67381 is a composite number with 4 divisors. Its prime factorisation is 43 × 1567. Divisors (4): 1, 43, 1567, 67381.
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How to work it out
- 1
What is special about 67381: a semiprime: 43 × 1567, the product of two primes.
- 2
67381 is composite. Its prime factorisation is
- 3
The divisors add up to 68992; without 67381 itself that is 1611, so 67381 is deficient (1611 is less than 67381). Euler's totient φ(67381) = 65772 numbers up to 67381 share no factor with it.
- 4
The digits of 67381 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 130 steps to reach 1.
LaTeX source of the formulas on this page
\[ 67381 = 43 \times 1567 \]
67381 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 68992 |
| Euler totient φ(n) | 65772 |
| Square | 4540199161 |
| Cube | 305923159667341 |
| Square root | 259.578505 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 130 |
| Scientific notation | 6.7381 × |
67381 in other forms
| Form | Value |
|---|---|
| In words | sixty-seven thousand three hundred and eighty-one |
| Binary (base 2) | 10000011100110101 |
| Octal (base 8) | 203465 |
| Hexadecimal (base 16) | 10735 |
| Base 3 | 10102102121 |
| As time | 67381 seconds = 18 h 43 min 1 s |
Is 67381 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 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 1) | 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 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 5) | 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 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 67381 a prime number?
No. 67381 = 43 × 1567, so it is divisible by 43.
What are the factors of 67381?
1, 43, 1567, 67381.
What is 67381 in binary?
10000011100110101 (hexadecimal 10735, octal 203465).
What is the square root of 67381?
About 259.5785.
Is 67381 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 67381?
67381 is a semiprime: 43 × 1567, the product of two primes.