The number 61390
61390 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 7 × 877. Divisors (16): 1, 2, 5, 7, 10, 14, 35, 70, 877, 1754, 4385, 6139, 8770, 12278, 30695, 61390.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
61390 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
61390 is composite. Its prime factorisation is
- 3
The divisors add up to 126432; without 61390 itself that is 65042, so 61390 is abundant (65042 is more than 61390). Euler's totient φ(61390) = 21024 numbers up to 61390 share no factor with it.
- 4
The digits of 61390 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 135 steps to reach 1.
LaTeX source of the formulas on this page
\[ 61390 = 2 \times 5 \times 7 \times 877 \]
61390 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 126432 |
| Euler totient φ(n) | 21024 |
| Square | 3768732100 |
| Cube | 231362463619000 |
| Square root | 247.770055 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 135 |
| Scientific notation | 6.139 × |
61390 in other forms
| Form | Value |
|---|---|
| In words | sixty-one thousand three hundred and ninety |
| Binary (base 2) | 1110111111001110 |
| Octal (base 8) | 167716 |
| Hexadecimal (base 16) | EFCE |
| Base 3 | 10010012201 |
| As time | 61390 seconds = 17 h 3 min 10 s |
Is 61390 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (61390 ÷ 2 = 30695) | 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 | Yes (61390 ÷ 5 = 12278) | 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 | Yes (61390 ÷ 7 = 8770) | 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 6) | 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 | Yes (61390 ÷ 10 = 6139) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | 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 61390 a prime number?
No. 61390 = 2 × 5 × 7 × 877, so it is divisible by 2.
What are the factors of 61390?
1, 2, 5, 7, 10, 14, 35, 70, 877, 1754, 4385, 6139, 8770, 12278, 30695, 61390.
What is 61390 in binary?
1110111111001110 (hexadecimal EFCE, octal 167716).
What is the square root of 61390?
About 247.7701.
Is 61390 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 61390?
It is a composite number with 16 divisors.