The number 77387
77387 is a composite number with 4 divisors. Its prime factorisation is 19 × 4073. Divisors (4): 1, 19, 4073, 77387.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 77387: a semiprime: 19 × 4073, the product of two primes.
- 2
77387 is composite. Its prime factorisation is
- 3
The divisors add up to 81480; without 77387 itself that is 4093, so 77387 is deficient (4093 is less than 77387). Euler's totient φ(77387) = 73296 numbers up to 77387 share no factor with it.
- 4
The digits of 77387 add up to 32, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 63 steps to reach 1.
LaTeX source of the formulas on this page
\[ 77387 = 19 \times 4073 \]
77387 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 81480 |
| Euler totient φ(n) | 73296 |
| Square | 5988747769 |
| Cube | 463451223599603 |
| Square root | 278.185190 |
| Digit sum / digital root | 32 / 5 |
| Collatz steps to 1 | 63 |
| Scientific notation | 7.7387 × |
77387 in other forms
| Form | Value |
|---|---|
| In words | seventy-seven thousand three hundred and eighty-seven |
| Binary (base 2) | 10010111001001011 |
| Octal (base 8) | 227113 |
| Hexadecimal (base 16) | 12E4B |
| Base 3 | 10221011012 |
| As time | 77387 seconds = 21 h 29 min 47 s |
Is 77387 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 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 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | 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 2) | 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 77387 a prime number?
No. 77387 = 19 × 4073, so it is divisible by 19.
What are the factors of 77387?
1, 19, 4073, 77387.
What is 77387 in binary?
10010111001001011 (hexadecimal 12E4B, octal 227113).
What is the square root of 77387?
About 278.1852.
Is 77387 divisible by 3?
No. Its digits add up to 32, which is not a multiple of 3.
What is special about the number 77387?
77387 is a semiprime: 19 × 4073, the product of two primes.