The number 27661
27661 is a composite number with 4 divisors. Its prime factorisation is 139 × 199. Divisors (4): 1, 139, 199, 27661.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 27661: a semiprime: 139 × 199, the product of two primes.
- 2
27661 is composite. Its prime factorisation is
- 3
The divisors add up to 28000; without 27661 itself that is 339, so 27661 is deficient (339 is less than 27661). Euler's totient φ(27661) = 27324 numbers up to 27661 share no factor with it.
- 4
The digits of 27661 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 46 steps to reach 1.
LaTeX source of the formulas on this page
\[ 27661 = 139 \times 199 \]
27661 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 28000 |
| Euler totient φ(n) | 27324 |
| Square | 765130921 |
| Cube | 21164286405781 |
| Square root | 166.315964 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 46 |
| Scientific notation | 2.7661 × |
27661 in other forms
| Form | Value |
|---|---|
| In words | twenty-seven thousand six hundred and sixty-one |
| Binary (base 2) | 110110000001101 |
| Octal (base 8) | 66015 |
| Hexadecimal (base 16) | 6C0D |
| Base 3 | 1101221111 |
| As time | 27661 seconds = 7 h 41 min 1 s |
Is 27661 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 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 5) | 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 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | 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 27661 a prime number?
No. 27661 = 139 × 199, so it is divisible by 139.
What are the factors of 27661?
1, 139, 199, 27661.
What is 27661 in binary?
110110000001101 (hexadecimal 6C0D, octal 66015).
What is the square root of 27661?
About 166.3160.
Is 27661 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 27661?
27661 is a semiprime: 139 × 199, the product of two primes.