The number 28267
28267 is a composite number with 4 divisors. Its prime factorisation is 23 × 1229. Divisors (4): 1, 23, 1229, 28267.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 28267: a semiprime: 23 × 1229, the product of two primes.
- 2
28267 is composite. Its prime factorisation is
- 3
The divisors add up to 29520; without 28267 itself that is 1253, so 28267 is deficient (1253 is less than 28267). Euler's totient φ(28267) = 27016 numbers up to 28267 share no factor with it.
- 4
The digits of 28267 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
\[ 28267 = 23 \times 1229 \]
28267 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 29520 |
| Euler totient φ(n) | 27016 |
| Square | 799023289 |
| Cube | 22585991310163 |
| Square root | 168.127927 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 134 |
| Scientific notation | 2.8267 × |
28267 in other forms
| Form | Value |
|---|---|
| In words | twenty-eight thousand two hundred and sixty-seven |
| Binary (base 2) | 110111001101011 |
| Octal (base 8) | 67153 |
| Hexadecimal (base 16) | 6E6B |
| Base 3 | 1102202221 |
| As time | 28267 seconds = 7 h 51 min 7 s |
Is 28267 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 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 1) | 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 3) | 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 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 8) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 28267 a prime number?
No. 28267 = 23 × 1229, so it is divisible by 23.
What are the factors of 28267?
1, 23, 1229, 28267.
What is 28267 in binary?
110111001101011 (hexadecimal 6E6B, octal 67153).
What is the square root of 28267?
About 168.1279.
Is 28267 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 28267?
28267 is a semiprime: 23 × 1229, the product of two primes.