The number 71487
71487 is a composite number with 18 divisors. Its prime factorisation is × × 47. Divisors (18): 1, 3, 9, 13, 39, 47, 117, 141, 169, 423, 507, 611, 1521, 1833, 5499, 7943 … 71487.
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How to work it out
- 1
71487 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
71487 is composite. Its prime factorisation is
- 3
The divisors add up to 114192; without 71487 itself that is 42705, so 71487 is deficient (42705 is less than 71487). Euler's totient φ(71487) = 43056 numbers up to 71487 share no factor with it.
- 4
The digits of 71487 add up to 27, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 125 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71487 = 3^{2} \times 13^{2} \times 47 \]71487 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 18 |
| Sum of divisors | 114192 |
| Euler totient φ(n) | 43056 |
| Square | 5110391169 |
| Cube | 365326533498303 |
| Square root | 267.370529 (= 39√47) |
| Digit sum / digital root | 27 / 9 |
| Collatz steps to 1 | 125 |
| Scientific notation | 7.1487 × |
71487 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand four hundred and eighty-seven |
| Binary (base 2) | 10001011100111111 |
| Octal (base 8) | 213477 |
| Hexadecimal (base 16) | 1173F |
| Base 3 | 10122001200 |
| As time | 71487 seconds = 19 h 51 min 27 s |
Is 71487 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 | Yes (71487 ÷ 3 = 23829) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | 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 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | Yes (71487 ÷ 9 = 7943) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | 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 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 71487 a prime number?
No. 71487 = × × 47, so it is divisible by 3.
What are the factors of 71487?
1, 3, 9, 13, 39, 47, 117, 141, 169, 423, 507, 611, 1521, 1833, 5499, 7943, 23829, 71487.
What is 71487 in binary?
10001011100111111 (hexadecimal 1173F, octal 213477).
What is the square root of 71487?
About 267.3705, exactly 39√47.
Is 71487 divisible by 3?
Yes. Its digits add up to 27, a multiple of 3.
What is special about the number 71487?
It is a composite number with 18 divisors.