The number 80842
80842 is a composite number with 8 divisors. Its prime factorisation is 2 × 83 × 487. Divisors (8): 1, 2, 83, 166, 487, 974, 40421, 80842.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
80842 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
80842 is composite. Its prime factorisation is
- 3
The divisors add up to 122976; without 80842 itself that is 42134, so 80842 is deficient (42134 is less than 80842). Euler's totient φ(80842) = 39852 numbers up to 80842 share no factor with it.
- 4
The digits of 80842 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 138 steps to reach 1.
LaTeX source of the formulas on this page
\[ 80842 = 2 \times 83 \times 487 \]
80842 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 122976 |
| Euler totient φ(n) | 39852 |
| Square | 6535428964 |
| Cube | 528337148307688 |
| Square root | 284.327276 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 138 |
| Scientific notation | 8.0842 × |
80842 in other forms
| Form | Value |
|---|---|
| In words | eighty thousand eight hundred and forty-two |
| Binary (base 2) | 10011101111001010 |
| Octal (base 8) | 235712 |
| Hexadecimal (base 16) | 13BCA |
| Base 3 | 11002220011 |
| As time | 80842 seconds = 22 h 27 min 22 s |
Is 80842 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (80842 ÷ 2 = 40421) | 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 6) | 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 4) | 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 3) | 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 80842 a prime number?
No. 80842 = 2 × 83 × 487, so it is divisible by 2.
What are the factors of 80842?
1, 2, 83, 166, 487, 974, 40421, 80842.
What is 80842 in binary?
10011101111001010 (hexadecimal 13BCA, octal 235712).
What is the square root of 80842?
About 284.3273.
Is 80842 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 80842?
It is a composite number with 8 divisors.