The number 28442
28442 is a composite number with 4 divisors. Its prime factorisation is 2 × 14221. Divisors (4): 1, 2, 14221, 28442.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 28442: a semiprime: 2 × 14221, the product of two primes.
- 2
28442 is composite. Its prime factorisation is
- 3
The divisors add up to 42666; without 28442 itself that is 14224, so 28442 is deficient (14224 is less than 28442). Euler's totient φ(28442) = 14220 numbers up to 28442 share no factor with it.
- 4
The digits of 28442 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 121 steps to reach 1.
LaTeX source of the formulas on this page
\[ 28442 = 2 \times 14221 \]
28442 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 42666 |
| Euler totient φ(n) | 14220 |
| Square | 808947364 |
| Cube | 23008080926888 |
| Square root | 168.647562 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 121 |
| Scientific notation | 2.8442 × |
28442 in other forms
| Form | Value |
|---|---|
| In words | twenty-eight thousand four hundred and forty-two |
| Binary (base 2) | 110111100011010 |
| Octal (base 8) | 67432 |
| Hexadecimal (base 16) | 6F1A |
| Base 3 | 1110000102 |
| As time | 28442 seconds = 7 h 54 min 2 s |
Is 28442 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (28442 ÷ 2 = 14221) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | 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 2) | 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 28442 a prime number?
No. 28442 = 2 × 14221, so it is divisible by 2.
What are the factors of 28442?
1, 2, 14221, 28442.
What is 28442 in binary?
110111100011010 (hexadecimal 6F1A, octal 67432).
What is the square root of 28442?
About 168.6476.
Is 28442 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 28442?
28442 is a semiprime: 2 × 14221, the product of two primes.