The number 28449
28449 is a composite number with 12 divisors. Its prime factorisation is × 29 × 109. Divisors (12): 1, 3, 9, 29, 87, 109, 261, 327, 981, 3161, 9483, 28449.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
28449 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
28449 is composite. Its prime factorisation is
- 3
The divisors add up to 42900; without 28449 itself that is 14451, so 28449 is deficient (14451 is less than 28449). Euler's totient φ(28449) = 18144 numbers up to 28449 share no factor with it.
- 4
The digits of 28449 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 59 steps to reach 1.
LaTeX source of the formulas on this page
\[ 28449 = 3^{2} \times 29 \times 109 \]28449 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 42900 |
| Euler totient φ(n) | 18144 |
| Square | 809345601 |
| Cube | 23025073002849 |
| Square root | 168.668314 (= 3√3161) |
| Digit sum / digital root | 27 / 9 |
| Collatz steps to 1 | 59 |
| Scientific notation | 2.8449 × |
28449 in other forms
| Form | Value |
|---|---|
| In words | twenty-eight thousand four hundred and forty-nine |
| Binary (base 2) | 110111100100001 |
| Octal (base 8) | 67441 |
| Hexadecimal (base 16) | 6F21 |
| Base 3 | 1110000200 |
| As time | 28449 seconds = 7 h 54 min 9 s |
Is 28449 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 (28449 ÷ 3 = 9483) | 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 1) | 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 (28449 ÷ 9 = 3161) | 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 3) | 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 28449 a prime number?
No. 28449 = × 29 × 109, so it is divisible by 3.
What are the factors of 28449?
1, 3, 9, 29, 87, 109, 261, 327, 981, 3161, 9483, 28449.
What is 28449 in binary?
110111100100001 (hexadecimal 6F21, octal 67441).
What is the square root of 28449?
About 168.6683, exactly 3√3161.
Is 28449 divisible by 3?
Yes. Its digits add up to 27, a multiple of 3.
What is special about the number 28449?
It is a composite number with 12 divisors.