The number 81474
81474 is a composite number with 16 divisors. Its prime factorisation is 2 × 3 × 37 × 367. Divisors (16): 1, 2, 3, 6, 37, 74, 111, 222, 367, 734, 1101, 2202, 13579, 27158, 40737, 81474.
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How to work it out
- 1
81474 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
81474 is composite. Its prime factorisation is
- 3
The divisors add up to 167808; without 81474 itself that is 86334, so 81474 is abundant (86334 is more than 81474). Euler's totient φ(81474) = 26352 numbers up to 81474 share no factor with it.
- 4
The digits of 81474 add up to 24, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 37 steps to reach 1.
LaTeX source of the formulas on this page
\[ 81474 = 2 \times 3 \times 37 \times 367 \]
81474 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 167808 |
| Euler totient φ(n) | 26352 |
| Square | 6638012676 |
| Cube | 540825444764424 |
| Square root | 285.436508 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 37 |
| Scientific notation | 8.1474 × |
81474 in other forms
| Form | Value |
|---|---|
| In words | eighty-one thousand four hundred and seventy-four |
| Binary (base 2) | 10011111001000010 |
| Octal (base 8) | 237102 |
| Hexadecimal (base 16) | 13E42 |
| Base 3 | 11010202120 |
| As time | 81474 seconds = 22 h 37 min 54 s |
Is 81474 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (81474 ÷ 2 = 40737) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (81474 ÷ 3 = 27158) | 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 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | Yes (81474 ÷ 6 = 13579) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 6) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 4) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 8) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 6) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 81474 a prime number?
No. 81474 = 2 × 3 × 37 × 367, so it is divisible by 2.
What are the factors of 81474?
1, 2, 3, 6, 37, 74, 111, 222, 367, 734, 1101, 2202, 13579, 27158, 40737, 81474.
What is 81474 in binary?
10011111001000010 (hexadecimal 13E42, octal 237102).
What is the square root of 81474?
About 285.4365.
Is 81474 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 81474?
It is a composite number with 16 divisors.