The number 87242
87242 is a composite number with 8 divisors. Its prime factorisation is 2 × 181 × 241. Divisors (8): 1, 2, 181, 241, 362, 482, 43621, 87242.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
87242 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
87242 is composite. Its prime factorisation is
- 3
The divisors add up to 132132; without 87242 itself that is 44890, so 87242 is deficient (44890 is less than 87242). Euler's totient φ(87242) = 43200 numbers up to 87242 share no factor with it.
- 4
The digits of 87242 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 71 steps to reach 1.
LaTeX source of the formulas on this page
\[ 87242 = 2 \times 181 \times 241 \]
87242 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 132132 |
| Euler totient φ(n) | 43200 |
| Square | 7611166564 |
| Cube | 664013393376488 |
| Square root | 295.367568 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 71 |
| Scientific notation | 8.7242 × |
87242 in other forms
| Form | Value |
|---|---|
| In words | eighty-seven thousand two hundred and forty-two |
| Binary (base 2) | 10101010011001010 |
| Octal (base 8) | 252312 |
| Hexadecimal (base 16) | 154CA |
| Base 3 | 11102200012 |
| As time | 87242 seconds = 24 h 14 min 2 s |
Is 87242 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (87242 ÷ 2 = 43621) | 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 | No (remainder 2) | 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 | No (remainder 1) | 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 2) | 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 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 87242 a prime number?
No. 87242 = 2 × 181 × 241, so it is divisible by 2.
What are the factors of 87242?
1, 2, 181, 241, 362, 482, 43621, 87242.
What is 87242 in binary?
10101010011001010 (hexadecimal 154CA, octal 252312).
What is the square root of 87242?
About 295.3676.
Is 87242 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 87242?
It is a composite number with 8 divisors.