The number 57742
57742 is a composite number with 4 divisors. Its prime factorisation is 2 × 28871. Divisors (4): 1, 2, 28871, 57742.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 57742: a semiprime: 2 × 28871, the product of two primes.
- 2
57742 is composite. Its prime factorisation is
- 3
The divisors add up to 86616; without 57742 itself that is 28874, so 57742 is deficient (28874 is less than 57742). Euler's totient φ(57742) = 28870 numbers up to 57742 share no factor with it.
- 4
The digits of 57742 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 73 steps to reach 1.
LaTeX source of the formulas on this page
\[ 57742 = 2 \times 28871 \]
57742 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 86616 |
| Euler totient φ(n) | 28870 |
| Square | 3334138564 |
| Cube | 192519828962488 |
| Square root | 240.295651 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 73 |
| Scientific notation | 5.7742 × |
57742 in other forms
| Form | Value |
|---|---|
| In words | fifty-seven thousand seven hundred and forty-two |
| Binary (base 2) | 1110000110001110 |
| Octal (base 8) | 160616 |
| Hexadecimal (base 16) | E18E |
| Base 3 | 2221012121 |
| As time | 57742 seconds = 16 h 2 min 22 s |
Is 57742 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (57742 ÷ 2 = 28871) | 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 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 4) | 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 6) | 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 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 57742 a prime number?
No. 57742 = 2 × 28871, so it is divisible by 2.
What are the factors of 57742?
1, 2, 28871, 57742.
What is 57742 in binary?
1110000110001110 (hexadecimal E18E, octal 160616).
What is the square root of 57742?
About 240.2957.
Is 57742 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 57742?
57742 is a semiprime: 2 × 28871, the product of two primes.