The number 28425
28425 is a composite number with 12 divisors. Its prime factorisation is 3 × × 379. Divisors (12): 1, 3, 5, 15, 25, 75, 379, 1137, 1895, 5685, 9475, 28425.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
28425 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
28425 is composite. Its prime factorisation is
- 3
The divisors add up to 47120; without 28425 itself that is 18695, so 28425 is deficient (18695 is less than 28425). Euler's totient φ(28425) = 15120 numbers up to 28425 share no factor with it.
- 4
The digits of 28425 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 103 steps to reach 1.
LaTeX source of the formulas on this page
\[ 28425 = 3 \times 5^{2} \times 379 \]28425 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 47120 |
| Euler totient φ(n) | 15120 |
| Square | 807980625 |
| Cube | 22966849265625 |
| Square root | 168.597153 (= 5√1137) |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 103 |
| Scientific notation | 2.8425 × |
28425 in other forms
| Form | Value |
|---|---|
| In words | twenty-eight thousand four hundred and twenty-five |
| Binary (base 2) | 110111100001001 |
| Octal (base 8) | 67411 |
| Hexadecimal (base 16) | 6F09 |
| Base 3 | 1102222210 |
| As time | 28425 seconds = 7 h 53 min 45 s |
Is 28425 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 (28425 ÷ 3 = 9475) | 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 | Yes (28425 ÷ 5 = 5685) | 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 5) | 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 3) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 5) | 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 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 28425 a prime number?
No. 28425 = 3 × × 379, so it is divisible by 3.
What are the factors of 28425?
1, 3, 5, 15, 25, 75, 379, 1137, 1895, 5685, 9475, 28425.
What is 28425 in binary?
110111100001001 (hexadecimal 6F09, octal 67411).
What is the square root of 28425?
About 168.5972, exactly 5√1137.
Is 28425 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 28425?
It is a composite number with 12 divisors.