The number 77109
77109 is a composite number with 4 divisors. Its prime factorisation is 3 × 25703. Divisors (4): 1, 3, 25703, 77109.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 77109: a semiprime: 3 × 25703, the product of two primes.
- 2
77109 is composite. Its prime factorisation is
- 3
The divisors add up to 102816; without 77109 itself that is 25707, so 77109 is deficient (25707 is less than 77109). Euler's totient φ(77109) = 51404 numbers up to 77109 share no factor with it.
- 4
The digits of 77109 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 125 steps to reach 1.
LaTeX source of the formulas on this page
\[ 77109 = 3 \times 25703 \]
77109 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 102816 |
| Euler totient φ(n) | 51404 |
| Square | 5945797881 |
| Cube | 458474528806029 |
| Square root | 277.685073 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 125 |
| Scientific notation | 7.7109 × |
77109 in other forms
| Form | Value |
|---|---|
| In words | seventy-seven thousand one hundred and nine |
| Binary (base 2) | 10010110100110101 |
| Octal (base 8) | 226465 |
| Hexadecimal (base 16) | 12D35 |
| Base 3 | 10220202220 |
| As time | 77109 seconds = 21 h 25 min 9 s |
Is 77109 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 (77109 ÷ 3 = 25703) | 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 4) | 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 10) | 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 77109 a prime number?
No. 77109 = 3 × 25703, so it is divisible by 3.
What are the factors of 77109?
1, 3, 25703, 77109.
What is 77109 in binary?
10010110100110101 (hexadecimal 12D35, octal 226465).
What is the square root of 77109?
About 277.6851.
Is 77109 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 77109?
77109 is a semiprime: 3 × 25703, the product of two primes.