The number 80729
80729 is a composite number with 8 divisors. Its prime factorisation is 11 × 41 × 179. Divisors (8): 1, 11, 41, 179, 451, 1969, 7339, 80729.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
80729 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
80729 is composite. Its prime factorisation is
- 3
The divisors add up to 90720; without 80729 itself that is 9991, so 80729 is deficient (9991 is less than 80729). Euler's totient φ(80729) = 71200 numbers up to 80729 share no factor with it.
- 4
The digits of 80729 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 50 steps to reach 1.
LaTeX source of the formulas on this page
\[ 80729 = 11 \times 41 \times 179 \]
80729 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 90720 |
| Euler totient φ(n) | 71200 |
| Square | 6517171441 |
| Cube | 526124733260489 |
| Square root | 284.128492 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 50 |
| Scientific notation | 8.0729 × |
80729 in other forms
| Form | Value |
|---|---|
| In words | eighty thousand seven hundred and twenty-nine |
| Binary (base 2) | 10011101101011001 |
| Octal (base 8) | 235531 |
| Hexadecimal (base 16) | 13B59 |
| Base 3 | 11002201222 |
| As time | 80729 seconds = 22 h 25 min 29 s |
Is 80729 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 2) | 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 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 5) | 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 8) | 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 | Yes (80729 ÷ 11 = 7339) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 80729 a prime number?
No. 80729 = 11 × 41 × 179, so it is divisible by 11.
What are the factors of 80729?
1, 11, 41, 179, 451, 1969, 7339, 80729.
What is 80729 in binary?
10011101101011001 (hexadecimal 13B59, octal 235531).
What is the square root of 80729?
About 284.1285.
Is 80729 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 80729?
It is a composite number with 8 divisors.