The number 27641
27641 is a composite number with 4 divisors. Its prime factorisation is 131 × 211. Divisors (4): 1, 131, 211, 27641.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 27641: a semiprime: 131 × 211, the product of two primes.
- 2
27641 is composite. Its prime factorisation is
- 3
The divisors add up to 27984; without 27641 itself that is 343, so 27641 is deficient (343 is less than 27641). Euler's totient φ(27641) = 27300 numbers up to 27641 share no factor with it.
- 4
The digits of 27641 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 165 steps to reach 1.
LaTeX source of the formulas on this page
\[ 27641 = 131 \times 211 \]
27641 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 27984 |
| Euler totient φ(n) | 27300 |
| Square | 764024881 |
| Cube | 21118411735721 |
| Square root | 166.255827 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 165 |
| Scientific notation | 2.7641 × |
27641 in other forms
| Form | Value |
|---|---|
| In words | twenty-seven thousand six hundred and forty-one |
| Binary (base 2) | 110101111111001 |
| Octal (base 8) | 65771 |
| Hexadecimal (base 16) | 6BF9 |
| Base 3 | 1101220202 |
| As time | 27641 seconds = 7 h 40 min 41 s |
Is 27641 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 | No (remainder 1) | 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 5) | 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 2) | 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 9) | 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 27641 a prime number?
No. 27641 = 131 × 211, so it is divisible by 131.
What are the factors of 27641?
1, 131, 211, 27641.
What is 27641 in binary?
110101111111001 (hexadecimal 6BF9, octal 65771).
What is the square root of 27641?
About 166.2558.
Is 27641 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 27641?
27641 is a semiprime: 131 × 211, the product of two primes.