The number 28089
28089 is a composite number with 6 divisors. Its prime factorisation is × 3121. Divisors (6): 1, 3, 9, 3121, 9363, 28089.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
28089 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
28089 is composite. Its prime factorisation is
- 3
The divisors add up to 40586; without 28089 itself that is 12497, so 28089 is deficient (12497 is less than 28089). Euler's totient φ(28089) = 18720 numbers up to 28089 share no factor with it.
- 4
The digits of 28089 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 46 steps to reach 1.
LaTeX source of the formulas on this page
\[ 28089 = 3^{2} \times 3121 \]28089 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 40586 |
| Euler totient φ(n) | 18720 |
| Square | 788991921 |
| Cube | 22161994068969 |
| Square root | 167.597733 (= 3√3121) |
| Digit sum / digital root | 27 / 9 |
| Collatz steps to 1 | 46 |
| Scientific notation | 2.8089 × |
28089 in other forms
| Form | Value |
|---|---|
| In words | twenty-eight thousand and eighty-nine |
| Binary (base 2) | 110110110111001 |
| Octal (base 8) | 66671 |
| Hexadecimal (base 16) | 6DB9 |
| Base 3 | 1102112100 |
| As time | 28089 seconds = 7 h 48 min 9 s |
Is 28089 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 (28089 ÷ 3 = 9363) | 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 5) | 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 (28089 ÷ 9 = 3121) | 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 28089 a prime number?
No. 28089 = × 3121, so it is divisible by 3.
What are the factors of 28089?
1, 3, 9, 3121, 9363, 28089.
What is 28089 in binary?
110110110111001 (hexadecimal 6DB9, octal 66671).
What is the square root of 28089?
About 167.5977, exactly 3√3121.
Is 28089 divisible by 3?
Yes. Its digits add up to 27, a multiple of 3.
What is special about the number 28089?
It is a composite number with 6 divisors.