The number 67985
67985 is a composite number with 4 divisors. Its prime factorisation is 5 × 13597. Divisors (4): 1, 5, 13597, 67985.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 67985: a semiprime: 5 × 13597, the product of two primes.
- 2
67985 is composite. Its prime factorisation is
- 3
The divisors add up to 81588; without 67985 itself that is 13603, so 67985 is deficient (13603 is less than 67985). Euler's totient φ(67985) = 54384 numbers up to 67985 share no factor with it.
- 4
The digits of 67985 add up to 35, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 86 steps to reach 1.
LaTeX source of the formulas on this page
\[ 67985 = 5 \times 13597 \]
67985 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 81588 |
| Euler totient φ(n) | 54384 |
| Square | 4621960225 |
| Cube | 314223965896625 |
| Square root | 260.739333 |
| Digit sum / digital root | 35 / 8 |
| Collatz steps to 1 | 86 |
| Scientific notation | 6.7985 × |
67985 in other forms
| Form | Value |
|---|---|
| In words | sixty-seven thousand nine hundred and eighty-five |
| Binary (base 2) | 10000100110010001 |
| Octal (base 8) | 204621 |
| Hexadecimal (base 16) | 10991 |
| Base 3 | 10110020222 |
| As time | 67985 seconds = 18 h 53 min 5 s |
Is 67985 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 2) | 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 | Yes (67985 ÷ 5 = 13597) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 67985 a prime number?
No. 67985 = 5 × 13597, so it is divisible by 5.
What are the factors of 67985?
1, 5, 13597, 67985.
What is 67985 in binary?
10000100110010001 (hexadecimal 10991, octal 204621).
What is the square root of 67985?
About 260.7393.
Is 67985 divisible by 3?
No. Its digits add up to 35, which is not a multiple of 3.
What is special about the number 67985?
67985 is a semiprime: 5 × 13597, the product of two primes.