The number 25428
25428 is a composite number with 24 divisors. Its prime factorisation is × 3 × 13 × 163. Divisors (24): 1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156, 163, 326, 489, 652 … 25428.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
25428 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
25428 is composite. Its prime factorisation is
- 3
The divisors add up to 64288; without 25428 itself that is 38860, so 25428 is abundant (38860 is more than 25428). Euler's totient φ(25428) = 7776 numbers up to 25428 share no factor with it.
- 4
The digits of 25428 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 33 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25428 = 2^{2} \times 3 \times 13 \times 163 \]25428 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 24 |
| Sum of divisors | 64288 |
| Euler totient φ(n) | 7776 |
| Square | 646583184 |
| Cube | 16441317202752 |
| Square root | 159.461594 (= 2√6357) |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 33 |
| Scientific notation | 2.5428 × |
25428 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand four hundred and twenty-eight |
| Binary (base 2) | 110001101010100 |
| Octal (base 8) | 61524 |
| Hexadecimal (base 16) | 6354 |
| Base 3 | 1021212210 |
| As time | 25428 seconds = 7 h 3 min 48 s |
Is 25428 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (25428 ÷ 2 = 12714) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (25428 ÷ 3 = 8476) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | Yes (25428 ÷ 4 = 6357) | 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 | Yes (25428 ÷ 6 = 4238) | 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 4) | 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 8) | 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 | Yes (25428 ÷ 12 = 2119) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 25428 a prime number?
No. 25428 = × 3 × 13 × 163, so it is divisible by 2.
What are the factors of 25428?
1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156, 163, 326, 489, 652, 978, 1956, 2119, 4238, 6357, 8476, 12714, 25428.
What is 25428 in binary?
110001101010100 (hexadecimal 6354, octal 61524).
What is the square root of 25428?
About 159.4616, exactly 2√6357.
Is 25428 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 25428?
It is a composite number with 24 divisors.