The number 55478
55478 is a composite number with 4 divisors. Its prime factorisation is 2 × 27739. Divisors (4): 1, 2, 27739, 55478.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55478: a semiprime: 2 × 27739, the product of two primes.
- 2
55478 is composite. Its prime factorisation is
- 3
The divisors add up to 83220; without 55478 itself that is 27742, so 55478 is deficient (27742 is less than 55478). Euler's totient φ(55478) = 27738 numbers up to 55478 share no factor with it.
- 4
The digits of 55478 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 184 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55478 = 2 \times 27739 \]
55478 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 83220 |
| Euler totient φ(n) | 27738 |
| Square | 3077808484 |
| Cube | 170750659075352 |
| Square root | 235.537683 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 184 |
| Scientific notation | 5.5478 × |
55478 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand four hundred and seventy-eight |
| Binary (base 2) | 1101100010110110 |
| Octal (base 8) | 154266 |
| Hexadecimal (base 16) | D8B6 |
| Base 3 | 2211002202 |
| As time | 55478 seconds = 15 h 24 min 38 s |
Is 55478 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (55478 ÷ 2 = 27739) | 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 3) | 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 3) | 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 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | 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 55478 a prime number?
No. 55478 = 2 × 27739, so it is divisible by 2.
What are the factors of 55478?
1, 2, 27739, 55478.
What is 55478 in binary?
1101100010110110 (hexadecimal D8B6, octal 154266).
What is the square root of 55478?
About 235.5377.
Is 55478 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 55478?
55478 is a semiprime: 2 × 27739, the product of two primes.