The number 71642
71642 is a composite number with 8 divisors. Its prime factorisation is 2 × 113 × 317. Divisors (8): 1, 2, 113, 226, 317, 634, 35821, 71642.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
71642 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
71642 is composite. Its prime factorisation is
- 3
The divisors add up to 108756; without 71642 itself that is 37114, so 71642 is deficient (37114 is less than 71642). Euler's totient φ(71642) = 35392 numbers up to 71642 share no factor with it.
- 4
The digits of 71642 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 99 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71642 = 2 \times 113 \times 317 \]
71642 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 108756 |
| Euler totient φ(n) | 35392 |
| Square | 5132576164 |
| Cube | 367708021541288 |
| Square root | 267.660232 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 99 |
| Scientific notation | 7.1642 × |
71642 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand six hundred and forty-two |
| Binary (base 2) | 10001011111011010 |
| Octal (base 8) | 213732 |
| Hexadecimal (base 16) | 117DA |
| Base 3 | 10122021102 |
| As time | 71642 seconds = 19 h 54 min 2 s |
Is 71642 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (71642 ÷ 2 = 35821) | 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 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 2) | 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 71642 a prime number?
No. 71642 = 2 × 113 × 317, so it is divisible by 2.
What are the factors of 71642?
1, 2, 113, 226, 317, 634, 35821, 71642.
What is 71642 in binary?
10001011111011010 (hexadecimal 117DA, octal 213732).
What is the square root of 71642?
About 267.6602.
Is 71642 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 71642?
It is a composite number with 8 divisors.