The number 77122
77122 is a composite number with 4 divisors. Its prime factorisation is 2 × 38561. Divisors (4): 1, 2, 38561, 77122.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 77122: a semiprime: 2 × 38561, the product of two primes.
- 2
77122 is composite. Its prime factorisation is
- 3
The divisors add up to 115686; without 77122 itself that is 38564, so 77122 is deficient (38564 is less than 77122). Euler's totient φ(77122) = 38560 numbers up to 77122 share no factor with it.
- 4
The digits of 77122 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 107 steps to reach 1.
LaTeX source of the formulas on this page
\[ 77122 = 2 \times 38561 \]
77122 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 115686 |
| Euler totient φ(n) | 38560 |
| Square | 5947802884 |
| Cube | 458706454019848 |
| Square root | 277.708480 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 107 |
| Scientific notation | 7.7122 × |
77122 in other forms
| Form | Value |
|---|---|
| In words | seventy-seven thousand one hundred and twenty-two |
| Binary (base 2) | 10010110101000010 |
| Octal (base 8) | 226502 |
| Hexadecimal (base 16) | 12D42 |
| Base 3 | 10220210101 |
| As time | 77122 seconds = 21 h 25 min 22 s |
Is 77122 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (77122 ÷ 2 = 38561) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 77122 a prime number?
No. 77122 = 2 × 38561, so it is divisible by 2.
What are the factors of 77122?
1, 2, 38561, 77122.
What is 77122 in binary?
10010110101000010 (hexadecimal 12D42, octal 226502).
What is the square root of 77122?
About 277.7085.
Is 77122 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 77122?
77122 is a semiprime: 2 × 38561, the product of two primes.