The number 87387
87387 is a composite number with 4 divisors. Its prime factorisation is 3 × 29129. Divisors (4): 1, 3, 29129, 87387.
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How to work it out
- 1
What is special about 87387: a semiprime: 3 × 29129, the product of two primes.
- 2
87387 is composite. Its prime factorisation is
- 3
The divisors add up to 116520; without 87387 itself that is 29133, so 87387 is deficient (29133 is less than 87387). Euler's totient φ(87387) = 58256 numbers up to 87387 share no factor with it.
- 4
The digits of 87387 add up to 33, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 102 steps to reach 1.
LaTeX source of the formulas on this page
\[ 87387 = 3 \times 29129 \]
87387 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 116520 |
| Euler totient φ(n) | 58256 |
| Square | 7636487769 |
| Cube | 667329756669603 |
| Square root | 295.612923 |
| Digit sum / digital root | 33 / 6 |
| Collatz steps to 1 | 102 |
| Scientific notation | 8.7387 × |
87387 in other forms
| Form | Value |
|---|---|
| In words | eighty-seven thousand three hundred and eighty-seven |
| Binary (base 2) | 10101010101011011 |
| Octal (base 8) | 252533 |
| Hexadecimal (base 16) | 1555B |
| Base 3 | 11102212120 |
| As time | 87387 seconds = 24 h 16 min 27 s |
Is 87387 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 | Yes (87387 ÷ 3 = 29129) | 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 | No (remainder 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | 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 6) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 87387 a prime number?
No. 87387 = 3 × 29129, so it is divisible by 3.
What are the factors of 87387?
1, 3, 29129, 87387.
What is 87387 in binary?
10101010101011011 (hexadecimal 1555B, octal 252533).
What is the square root of 87387?
About 295.6129.
Is 87387 divisible by 3?
Yes. Its digits add up to 33, a multiple of 3.
What is special about the number 87387?
87387 is a semiprime: 3 × 29129, the product of two primes.