The number 25550
25550 is a composite number with 24 divisors. Its prime factorisation is 2 × × 7 × 73. Divisors (24): 1, 2, 5, 7, 10, 14, 25, 35, 50, 70, 73, 146, 175, 350, 365, 511 … 25550.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 25550: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
25550 is composite. Its prime factorisation is
- 3
The divisors add up to 55056; without 25550 itself that is 29506, so 25550 is abundant (29506 is more than 25550). Euler's totient φ(25550) = 8640 numbers up to 25550 share no factor with it.
- 4
The digits of 25550 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 157 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25550 = 2 \times 5^{2} \times 7 \times 73 \]25550 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 24 |
| Sum of divisors | 55056 |
| Euler totient φ(n) | 8640 |
| Square | 652802500 |
| Cube | 16679103875000 |
| Square root | 159.843674 (= 5√1022) |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 157 |
| Scientific notation | 2.555 × |
25550 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand five hundred and fifty |
| Binary (base 2) | 110001111001110 |
| Octal (base 8) | 61716 |
| Hexadecimal (base 16) | 63CE |
| Base 3 | 1022001022 |
| As time | 25550 seconds = 7 h 5 min 50 s |
Is 25550 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (25550 ÷ 2 = 12775) | 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 | Yes (25550 ÷ 5 = 5110) | 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 | Yes (25550 ÷ 7 = 3650) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (25550 ÷ 10 = 2555) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 8) | 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 25550 a prime number?
No. 25550 = 2 × × 7 × 73, so it is divisible by 2.
What are the factors of 25550?
1, 2, 5, 7, 10, 14, 25, 35, 50, 70, 73, 146, 175, 350, 365, 511, 730, 1022, 1825, 2555, 3650, 5110, 12775, 25550.
What is 25550 in binary?
110001111001110 (hexadecimal 63CE, octal 61716).
What is the square root of 25550?
About 159.8437, exactly 5√1022.
Is 25550 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 25550?
25550 is a happy number: repeatedly adding the squares of its digits reaches 1.