The number 80709
80709 is a composite number with 4 divisors. Its prime factorisation is 3 × 26903. Divisors (4): 1, 3, 26903, 80709.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 80709: a semiprime: 3 × 26903, the product of two primes.
- 2
80709 is composite. Its prime factorisation is
- 3
The divisors add up to 107616; without 80709 itself that is 26907, so 80709 is deficient (26907 is less than 80709). Euler's totient φ(80709) = 53804 numbers up to 80709 share no factor with it.
- 4
The digits of 80709 add up to 24, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 138 steps to reach 1.
LaTeX source of the formulas on this page
\[ 80709 = 3 \times 26903 \]
80709 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 107616 |
| Euler totient φ(n) | 53804 |
| Square | 6513942681 |
| Cube | 525733799840829 |
| Square root | 284.093295 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 138 |
| Scientific notation | 8.0709 × |
80709 in other forms
| Form | Value |
|---|---|
| In words | eighty thousand seven hundred and nine |
| Binary (base 2) | 10011101101000101 |
| Octal (base 8) | 235505 |
| Hexadecimal (base 16) | 13B45 |
| Base 3 | 11002201020 |
| As time | 80709 seconds = 22 h 25 min 9 s |
Is 80709 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 (80709 ÷ 3 = 26903) | 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 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 5) | 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 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 80709 a prime number?
No. 80709 = 3 × 26903, so it is divisible by 3.
What are the factors of 80709?
1, 3, 26903, 80709.
What is 80709 in binary?
10011101101000101 (hexadecimal 13B45, octal 235505).
What is the square root of 80709?
About 284.0933.
Is 80709 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 80709?
80709 is a semiprime: 3 × 26903, the product of two primes.