The number 28023
28023 is a composite number with 4 divisors. Its prime factorisation is 3 × 9341. Divisors (4): 1, 3, 9341, 28023.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 28023: a semiprime: 3 × 9341, the product of two primes.
- 2
28023 is composite. Its prime factorisation is
- 3
The divisors add up to 37368; without 28023 itself that is 9345, so 28023 is deficient (9345 is less than 28023). Euler's totient φ(28023) = 18680 numbers up to 28023 share no factor with it.
- 4
The digits of 28023 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 152 steps to reach 1.
LaTeX source of the formulas on this page
\[ 28023 = 3 \times 9341 \]
28023 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 37368 |
| Euler totient φ(n) | 18680 |
| Square | 785288529 |
| Cube | 22006140448167 |
| Square root | 167.400717 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 152 |
| Scientific notation | 2.8023 × |
28023 in other forms
| Form | Value |
|---|---|
| In words | twenty-eight thousand and twenty-three |
| Binary (base 2) | 110110101110111 |
| Octal (base 8) | 66567 |
| Hexadecimal (base 16) | 6D77 |
| Base 3 | 1102102220 |
| As time | 28023 seconds = 7 h 47 min 3 s |
Is 28023 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 (28023 ÷ 3 = 9341) | 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 3) | 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 2) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 6) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 3) | 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 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 28023 a prime number?
No. 28023 = 3 × 9341, so it is divisible by 3.
What are the factors of 28023?
1, 3, 9341, 28023.
What is 28023 in binary?
110110101110111 (hexadecimal 6D77, octal 66567).
What is the square root of 28023?
About 167.4007.
Is 28023 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 28023?
28023 is a semiprime: 3 × 9341, the product of two primes.