The number 80642
80642 is a composite number with 8 divisors. Its prime factorisation is 2 × 61 × 661. Divisors (8): 1, 2, 61, 122, 661, 1322, 40321, 80642.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
80642 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
80642 is composite. Its prime factorisation is
- 3
The divisors add up to 123132; without 80642 itself that is 42490, so 80642 is deficient (42490 is less than 80642). Euler's totient φ(80642) = 39600 numbers up to 80642 share no factor with it.
- 4
The digits of 80642 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 94 steps to reach 1.
LaTeX source of the formulas on this page
\[ 80642 = 2 \times 61 \times 661 \]
80642 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 123132 |
| Euler totient φ(n) | 39600 |
| Square | 6503132164 |
| Cube | 524425583969288 |
| Square root | 283.975351 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 94 |
| Scientific notation | 8.0642 × |
80642 in other forms
| Form | Value |
|---|---|
| In words | eighty thousand six hundred and forty-two |
| Binary (base 2) | 10011101100000010 |
| Octal (base 8) | 235402 |
| Hexadecimal (base 16) | 13B02 |
| Base 3 | 11002121202 |
| As time | 80642 seconds = 22 h 24 min 2 s |
Is 80642 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (80642 ÷ 2 = 40321) | 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 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 2) | 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 2) | 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 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 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 80642 a prime number?
No. 80642 = 2 × 61 × 661, so it is divisible by 2.
What are the factors of 80642?
1, 2, 61, 122, 661, 1322, 40321, 80642.
What is 80642 in binary?
10011101100000010 (hexadecimal 13B02, octal 235402).
What is the square root of 80642?
About 283.9754.
Is 80642 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 80642?
It is a composite number with 8 divisors.