The number 55587
55587 is a composite number with 8 divisors. Its prime factorisation is 3 × 7 × 2647. Divisors (8): 1, 3, 7, 21, 2647, 7941, 18529, 55587.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55587: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
55587 is composite. Its prime factorisation is
- 3
The divisors add up to 84736; without 55587 itself that is 29149, so 55587 is deficient (29149 is less than 55587). Euler's totient φ(55587) = 31752 numbers up to 55587 share no factor with it.
- 4
The digits of 55587 add up to 30, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 140 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55587 = 3 \times 7 \times 2647 \]
55587 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 84736 |
| Euler totient φ(n) | 31752 |
| Square | 3089914569 |
| Cube | 171759081147003 |
| Square root | 235.768955 |
| Digit sum / digital root | 30 / 3 |
| Collatz steps to 1 | 140 |
| Scientific notation | 5.5587 × |
55587 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand five hundred and eighty-seven |
| Binary (base 2) | 1101100100100011 |
| Octal (base 8) | 154443 |
| Hexadecimal (base 16) | D923 |
| Base 3 | 2211020210 |
| As time | 55587 seconds = 15 h 26 min 27 s |
Is 55587 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 (55587 ÷ 3 = 18529) | 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 | Yes (55587 ÷ 7 = 7941) | 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 3) | 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 4) | 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 55587 a prime number?
No. 55587 = 3 × 7 × 2647, so it is divisible by 3.
What are the factors of 55587?
1, 3, 7, 21, 2647, 7941, 18529, 55587.
What is 55587 in binary?
1101100100100011 (hexadecimal D923, octal 154443).
What is the square root of 55587?
About 235.7690.
Is 55587 divisible by 3?
Yes. Its digits add up to 30, a multiple of 3.
What is special about the number 55587?
55587 is a happy number: repeatedly adding the squares of its digits reaches 1.