The number 71490
71490 is a composite number with 16 divisors. Its prime factorisation is 2 × 3 × 5 × 2383. Divisors (16): 1, 2, 3, 5, 6, 10, 15, 30, 2383, 4766, 7149, 11915, 14298, 23830, 35745, 71490.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
71490 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
71490 is composite. Its prime factorisation is
- 3
The divisors add up to 171648; without 71490 itself that is 100158, so 71490 is abundant (100158 is more than 71490). Euler's totient φ(71490) = 19056 numbers up to 71490 share no factor with it.
- 4
The digits of 71490 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 125 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71490 = 2 \times 3 \times 5 \times 2383 \]
71490 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 171648 |
| Euler totient φ(n) | 19056 |
| Square | 5110820100 |
| Cube | 365372528949000 |
| Square root | 267.376140 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 125 |
| Scientific notation | 7.149 × |
71490 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand four hundred and ninety |
| Binary (base 2) | 10001011101000010 |
| Octal (base 8) | 213502 |
| Hexadecimal (base 16) | 11742 |
| Base 3 | 10122001210 |
| As time | 71490 seconds = 19 h 51 min 30 s |
Is 71490 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (71490 ÷ 2 = 35745) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (71490 ÷ 3 = 23830) | 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 | Yes (71490 ÷ 5 = 14298) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | Yes (71490 ÷ 6 = 11915) | 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 3) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (71490 ÷ 10 = 7149) | 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 6) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 71490 a prime number?
No. 71490 = 2 × 3 × 5 × 2383, so it is divisible by 2.
What are the factors of 71490?
1, 2, 3, 5, 6, 10, 15, 30, 2383, 4766, 7149, 11915, 14298, 23830, 35745, 71490.
What is 71490 in binary?
10001011101000010 (hexadecimal 11742, octal 213502).
What is the square root of 71490?
About 267.3761.
Is 71490 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 71490?
It is a composite number with 16 divisors.