The number 25675
25675 is a composite number with 12 divisors. Its prime factorisation is × 13 × 79. Divisors (12): 1, 5, 13, 25, 65, 79, 325, 395, 1027, 1975, 5135, 25675.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 25675: a happy number: repeatedly adding the squares of its digits reaches 1; a Harshad number: divisible by its digit sum 25.
- 2
25675 is composite. Its prime factorisation is
- 3
The divisors add up to 34720; without 25675 itself that is 9045, so 25675 is deficient (9045 is less than 25675). Euler's totient φ(25675) = 18720 numbers up to 25675 share no factor with it.
- 4
The digits of 25675 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 64 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25675 = 5^{2} \times 13 \times 79 \]25675 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 34720 |
| Euler totient φ(n) | 18720 |
| Square | 659205625 |
| Cube | 16925104421875 |
| Square root | 160.234204 (= 5√1027) |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 64 |
| Scientific notation | 2.5675 × |
25675 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand six hundred and seventy-five |
| Binary (base 2) | 110010001001011 |
| Octal (base 8) | 62113 |
| Hexadecimal (base 16) | 644B |
| Base 3 | 1022012221 |
| As time | 25675 seconds = 7 h 7 min 55 s |
Is 25675 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (25675 ÷ 5 = 5135) | 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 | No (remainder 6) | 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 3) | 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 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 25675 a prime number?
No. 25675 = × 13 × 79, so it is divisible by 5.
What are the factors of 25675?
1, 5, 13, 25, 65, 79, 325, 395, 1027, 1975, 5135, 25675.
What is 25675 in binary?
110010001001011 (hexadecimal 644B, octal 62113).
What is the square root of 25675?
About 160.2342, exactly 5√1027.
Is 25675 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 25675?
25675 is a happy number: repeatedly adding the squares of its digits reaches 1; a Harshad number: divisible by its digit sum 25.