The number 77138
77138 is a composite number with 4 divisors. Its prime factorisation is 2 × 38569. Divisors (4): 1, 2, 38569, 77138.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 77138: a semiprime: 2 × 38569, the product of two primes.
- 2
77138 is composite. Its prime factorisation is
- 3
The divisors add up to 115710; without 77138 itself that is 38572, so 77138 is deficient (38572 is less than 77138). Euler's totient φ(77138) = 38568 numbers up to 77138 share no factor with it.
- 4
The digits of 77138 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 81 steps to reach 1.
LaTeX source of the formulas on this page
\[ 77138 = 2 \times 38569 \]
77138 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 115710 |
| Euler totient φ(n) | 38568 |
| Square | 5950271044 |
| Cube | 458992007792072 |
| Square root | 277.737286 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 81 |
| Scientific notation | 7.7138 × |
77138 in other forms
| Form | Value |
|---|---|
| In words | seventy-seven thousand one hundred and thirty-eight |
| Binary (base 2) | 10010110101010010 |
| Octal (base 8) | 226522 |
| Hexadecimal (base 16) | 12D52 |
| Base 3 | 10220210222 |
| As time | 77138 seconds = 21 h 25 min 38 s |
Is 77138 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (77138 ÷ 2 = 38569) | 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 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 2) | 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 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | 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 77138 a prime number?
No. 77138 = 2 × 38569, so it is divisible by 2.
What are the factors of 77138?
1, 2, 38569, 77138.
What is 77138 in binary?
10010110101010010 (hexadecimal 12D52, octal 226522).
What is the square root of 77138?
About 277.7373.
Is 77138 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 77138?
77138 is a semiprime: 2 × 38569, the product of two primes.