The number 61742
61742 is a composite number with 4 divisors. Its prime factorisation is 2 × 30871. Divisors (4): 1, 2, 30871, 61742.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 61742: a semiprime: 2 × 30871, the product of two primes.
- 2
61742 is composite. Its prime factorisation is
- 3
The divisors add up to 92616; without 61742 itself that is 30874, so 61742 is deficient (30874 is less than 61742). Euler's totient φ(61742) = 30870 numbers up to 61742 share no factor with it.
- 4
The digits of 61742 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 55 steps to reach 1.
LaTeX source of the formulas on this page
\[ 61742 = 2 \times 30871 \]
61742 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 92616 |
| Euler totient φ(n) | 30870 |
| Square | 3812074564 |
| Cube | 235365107730488 |
| Square root | 248.479375 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 55 |
| Scientific notation | 6.1742 × |
61742 in other forms
| Form | Value |
|---|---|
| In words | sixty-one thousand seven hundred and forty-two |
| Binary (base 2) | 1111000100101110 |
| Octal (base 8) | 170456 |
| Hexadecimal (base 16) | F12E |
| Base 3 | 10010200202 |
| As time | 61742 seconds = 17 h 9 min 2 s |
Is 61742 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (61742 ÷ 2 = 30871) | 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 2) | 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 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | 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 6) | 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 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 61742 a prime number?
No. 61742 = 2 × 30871, so it is divisible by 2.
What are the factors of 61742?
1, 2, 30871, 61742.
What is 61742 in binary?
1111000100101110 (hexadecimal F12E, octal 170456).
What is the square root of 61742?
About 248.4794.
Is 61742 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 61742?
61742 is a semiprime: 2 × 30871, the product of two primes.