The number 87489
87489 is a composite number with 6 divisors. Its prime factorisation is × 9721. Divisors (6): 1, 3, 9, 9721, 29163, 87489.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
87489 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
87489 is composite. Its prime factorisation is
- 3
The divisors add up to 126386; without 87489 itself that is 38897, so 87489 is deficient (38897 is less than 87489). Euler's totient φ(87489) = 58320 numbers up to 87489 share no factor with it.
- 4
The digits of 87489 add up to 36, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 120 steps to reach 1.
LaTeX source of the formulas on this page
\[ 87489 = 3^{2} \times 9721 \]87489 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 126386 |
| Euler totient φ(n) | 58320 |
| Square | 7654325121 |
| Cube | 669669250511169 |
| Square root | 295.785395 (= 3√9721) |
| Digit sum / digital root | 36 / 9 |
| Collatz steps to 1 | 120 |
| Scientific notation | 8.7489 × |
87489 in other forms
| Form | Value |
|---|---|
| In words | eighty-seven thousand four hundred and eighty-nine |
| Binary (base 2) | 10101010111000001 |
| Octal (base 8) | 252701 |
| Hexadecimal (base 16) | 155C1 |
| Base 3 | 11110000100 |
| As time | 87489 seconds = 24 h 18 min 9 s |
Is 87489 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 (87489 ÷ 3 = 29163) | 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 4) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | Yes (87489 ÷ 9 = 9721) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 87489 a prime number?
No. 87489 = × 9721, so it is divisible by 3.
What are the factors of 87489?
1, 3, 9, 9721, 29163, 87489.
What is 87489 in binary?
10101010111000001 (hexadecimal 155C1, octal 252701).
What is the square root of 87489?
About 295.7854, exactly 3√9721.
Is 87489 divisible by 3?
Yes. Its digits add up to 36, a multiple of 3.
What is special about the number 87489?
It is a composite number with 6 divisors.