The number 28249
28249 is a composite number with 8 divisors. Its prime factorisation is 13 × 41 × 53. Divisors (8): 1, 13, 41, 53, 533, 689, 2173, 28249.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
28249 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
28249 is composite. Its prime factorisation is
- 3
The divisors add up to 31752; without 28249 itself that is 3503, so 28249 is deficient (3503 is less than 28249). Euler's totient φ(28249) = 24960 numbers up to 28249 share no factor with it.
- 4
The digits of 28249 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 134 steps to reach 1.
LaTeX source of the formulas on this page
\[ 28249 = 13 \times 41 \times 53 \]
28249 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 31752 |
| Euler totient φ(n) | 24960 |
| Square | 798006001 |
| Cube | 22542871522249 |
| Square root | 168.074388 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 134 |
| Scientific notation | 2.8249 × |
28249 in other forms
| Form | Value |
|---|---|
| In words | twenty-eight thousand two hundred and forty-nine |
| Binary (base 2) | 110111001011001 |
| Octal (base 8) | 67131 |
| Hexadecimal (base 16) | 6E59 |
| Base 3 | 1102202021 |
| As time | 28249 seconds = 7 h 50 min 49 s |
Is 28249 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 | No (remainder 1) | 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 1) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | 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 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 28249 a prime number?
No. 28249 = 13 × 41 × 53, so it is divisible by 13.
What are the factors of 28249?
1, 13, 41, 53, 533, 689, 2173, 28249.
What is 28249 in binary?
110111001011001 (hexadecimal 6E59, octal 67131).
What is the square root of 28249?
About 168.0744.
Is 28249 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 28249?
It is a composite number with 8 divisors.