The number 87425
87425 is a composite number with 12 divisors. Its prime factorisation is × 13 × 269. Divisors (12): 1, 5, 13, 25, 65, 269, 325, 1345, 3497, 6725, 17485, 87425.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
87425 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
87425 is composite. Its prime factorisation is
- 3
The divisors add up to 117180; without 87425 itself that is 29755, so 87425 is deficient (29755 is less than 87425). Euler's totient φ(87425) = 64320 numbers up to 87425 share no factor with it.
- 4
The digits of 87425 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 102 steps to reach 1.
LaTeX source of the formulas on this page
\[ 87425 = 5^{2} \times 13 \times 269 \]87425 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 117180 |
| Euler totient φ(n) | 64320 |
| Square | 7643130625 |
| Cube | 668200694890625 |
| Square root | 295.677189 (= 5√3497) |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 102 |
| Scientific notation | 8.7425 × |
87425 in other forms
| Form | Value |
|---|---|
| In words | eighty-seven thousand four hundred and twenty-five |
| Binary (base 2) | 10101010110000001 |
| Octal (base 8) | 252601 |
| Hexadecimal (base 16) | 15581 |
| Base 3 | 11102220222 |
| As time | 87425 seconds = 24 h 17 min 5 s |
Is 87425 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 2) | 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 (87425 ÷ 5 = 17485) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | 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 8) | 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 8) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 87425 a prime number?
No. 87425 = × 13 × 269, so it is divisible by 5.
What are the factors of 87425?
1, 5, 13, 25, 65, 269, 325, 1345, 3497, 6725, 17485, 87425.
What is 87425 in binary?
10101010110000001 (hexadecimal 15581, octal 252601).
What is the square root of 87425?
About 295.6772, exactly 5√3497.
Is 87425 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 87425?
It is a composite number with 12 divisors.