The number 55729
55729 is a composite number with 4 divisors. Its prime factorisation is 23 × 2423. Divisors (4): 1, 23, 2423, 55729.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55729: a semiprime: 23 × 2423, the product of two primes.
- 2
55729 is composite. Its prime factorisation is
- 3
The divisors add up to 58176; without 55729 itself that is 2447, so 55729 is deficient (2447 is less than 55729). Euler's totient φ(55729) = 53284 numbers up to 55729 share no factor with it.
- 4
The digits of 55729 add up to 28, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 91 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55729 = 23 \times 2423 \]
55729 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 58176 |
| Euler totient φ(n) | 53284 |
| Square | 3105721441 |
| Cube | 173078750185489 |
| Square root | 236.069905 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 91 |
| Scientific notation | 5.5729 × |
55729 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand seven hundred and twenty-nine |
| Binary (base 2) | 1101100110110001 |
| Octal (base 8) | 154661 |
| Hexadecimal (base 16) | D9B1 |
| Base 3 | 2211110001 |
| As time | 55729 seconds = 15 h 28 min 49 s |
Is 55729 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 1) | 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 | No (remainder 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | 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 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | 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 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 55729 a prime number?
No. 55729 = 23 × 2423, so it is divisible by 23.
What are the factors of 55729?
1, 23, 2423, 55729.
What is 55729 in binary?
1101100110110001 (hexadecimal D9B1, octal 154661).
What is the square root of 55729?
About 236.0699.
Is 55729 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 55729?
55729 is a semiprime: 23 × 2423, the product of two primes.