The number 25585
25585 is a composite number with 16 divisors. Its prime factorisation is 5 × 7 × 17 × 43. Divisors (16): 1, 5, 7, 17, 35, 43, 85, 119, 215, 301, 595, 731, 1505, 3655, 5117, 25585.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
25585 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
25585 is composite. Its prime factorisation is
- 3
The divisors add up to 38016; without 25585 itself that is 12431, so 25585 is deficient (12431 is less than 25585). Euler's totient φ(25585) = 16128 numbers up to 25585 share no factor with it.
- 4
The digits of 25585 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 77 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25585 = 5 \times 7 \times 17 \times 43 \]
25585 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 38016 |
| Euler totient φ(n) | 16128 |
| Square | 654592225 |
| Cube | 16747742076625 |
| Square root | 159.953118 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 77 |
| Scientific notation | 2.5585 × |
25585 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand five hundred and eighty-five |
| Binary (base 2) | 110001111110001 |
| Octal (base 8) | 61761 |
| Hexadecimal (base 16) | 63F1 |
| Base 3 | 1022002121 |
| As time | 25585 seconds = 7 h 6 min 25 s |
Is 25585 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 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (25585 ÷ 5 = 5117) | 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 | Yes (25585 ÷ 7 = 3655) | 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 7) | 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 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 25585 a prime number?
No. 25585 = 5 × 7 × 17 × 43, so it is divisible by 5.
What are the factors of 25585?
1, 5, 7, 17, 35, 43, 85, 119, 215, 301, 595, 731, 1505, 3655, 5117, 25585.
What is 25585 in binary?
110001111110001 (hexadecimal 63F1, octal 61761).
What is the square root of 25585?
About 159.9531.
Is 25585 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 25585?
It is a composite number with 16 divisors.