The number 80731
80731 is a composite number with 8 divisors. Its prime factorisation is 7 × 19 × 607. Divisors (8): 1, 7, 19, 133, 607, 4249, 11533, 80731.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 80731: a Harshad number: divisible by its digit sum 19.
- 2
80731 is composite. Its prime factorisation is
- 3
The divisors add up to 97280; without 80731 itself that is 16549, so 80731 is deficient (16549 is less than 80731). Euler's totient φ(80731) = 65448 numbers up to 80731 share no factor with it.
- 4
The digits of 80731 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 169 steps to reach 1.
LaTeX source of the formulas on this page
\[ 80731 = 7 \times 19 \times 607 \]
80731 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 97280 |
| Euler totient φ(n) | 65448 |
| Square | 6517494361 |
| Cube | 526163837257891 |
| Square root | 284.132012 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 169 |
| Scientific notation | 8.0731 × |
80731 in other forms
| Form | Value |
|---|---|
| In words | eighty thousand seven hundred and thirty-one |
| Binary (base 2) | 10011101101011011 |
| Octal (base 8) | 235533 |
| Hexadecimal (base 16) | 13B5B |
| Base 3 | 11002202001 |
| As time | 80731 seconds = 22 h 25 min 31 s |
Is 80731 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 1) | 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 | Yes (80731 ÷ 7 = 11533) | 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 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 1) | 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 80731 a prime number?
No. 80731 = 7 × 19 × 607, so it is divisible by 7.
What are the factors of 80731?
1, 7, 19, 133, 607, 4249, 11533, 80731.
What is 80731 in binary?
10011101101011011 (hexadecimal 13B5B, octal 235533).
What is the square root of 80731?
About 284.1320.
Is 80731 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 80731?
80731 is a Harshad number: divisible by its digit sum 19.