The number 77087
77087 is a composite number with 4 divisors. Its prime factorisation is 157 × 491. Divisors (4): 1, 157, 491, 77087.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 77087: a semiprime: 157 × 491, the product of two primes.
- 2
77087 is composite. Its prime factorisation is
- 3
The divisors add up to 77736; without 77087 itself that is 649, so 77087 is deficient (649 is less than 77087). Euler's totient φ(77087) = 76440 numbers up to 77087 share no factor with it.
- 4
The digits of 77087 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 50 steps to reach 1.
LaTeX source of the formulas on this page
\[ 77087 = 157 \times 491 \]
77087 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 77736 |
| Euler totient φ(n) | 76440 |
| Square | 5942405569 |
| Cube | 458082218097503 |
| Square root | 277.645457 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 50 |
| Scientific notation | 7.7087 × |
77087 in other forms
| Form | Value |
|---|---|
| In words | seventy-seven thousand and eighty-seven |
| Binary (base 2) | 10010110100011111 |
| Octal (base 8) | 226437 |
| Hexadecimal (base 16) | 12D1F |
| Base 3 | 10220202002 |
| As time | 77087 seconds = 21 h 24 min 47 s |
Is 77087 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 2) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | 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 5) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | 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 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 77087 a prime number?
No. 77087 = 157 × 491, so it is divisible by 157.
What are the factors of 77087?
1, 157, 491, 77087.
What is 77087 in binary?
10010110100011111 (hexadecimal 12D1F, octal 226437).
What is the square root of 77087?
About 277.6455.
Is 77087 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 77087?
77087 is a semiprime: 157 × 491, the product of two primes.