The number 77989
77989 is a composite number with 4 divisors. Its prime factorisation is 167 × 467. Divisors (4): 1, 167, 467, 77989.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 77989: a semiprime: 167 × 467, the product of two primes.
- 2
77989 is composite. Its prime factorisation is
- 3
The divisors add up to 78624; without 77989 itself that is 635, so 77989 is deficient (635 is less than 77989). Euler's totient φ(77989) = 77356 numbers up to 77989 share no factor with it.
- 4
The digits of 77989 add up to 40, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 169 steps to reach 1.
LaTeX source of the formulas on this page
\[ 77989 = 167 \times 467 \]
77989 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 78624 |
| Euler totient φ(n) | 77356 |
| Square | 6082284121 |
| Cube | 474351256312669 |
| Square root | 279.265107 |
| Digit sum / digital root | 40 / 4 |
| Collatz steps to 1 | 169 |
| Scientific notation | 7.7989 × |
77989 in other forms
| Form | Value |
|---|---|
| In words | seventy-seven thousand nine hundred and eighty-nine |
| Binary (base 2) | 10011000010100101 |
| Octal (base 8) | 230245 |
| Hexadecimal (base 16) | 130A5 |
| Base 3 | 10221222111 |
| As time | 77989 seconds = 21 h 39 min 49 s |
Is 77989 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 1) | 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 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | 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 4) | 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 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 77989 a prime number?
No. 77989 = 167 × 467, so it is divisible by 167.
What are the factors of 77989?
1, 167, 467, 77989.
What is 77989 in binary?
10011000010100101 (hexadecimal 130A5, octal 230245).
What is the square root of 77989?
About 279.2651.
Is 77989 divisible by 3?
No. Its digits add up to 40, which is not a multiple of 3.
What is special about the number 77989?
77989 is a semiprime: 167 × 467, the product of two primes.