The number 72946
72946 is a composite number with 4 divisors. Its prime factorisation is 2 × 36473. Divisors (4): 1, 2, 36473, 72946.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 72946: a semiprime: 2 × 36473, the product of two primes.
- 2
72946 is composite. Its prime factorisation is
- 3
The divisors add up to 109422; without 72946 itself that is 36476, so 72946 is deficient (36476 is less than 72946). Euler's totient φ(72946) = 36472 numbers up to 72946 share no factor with it.
- 4
The digits of 72946 add up to 28, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 125 steps to reach 1.
LaTeX source of the formulas on this page
\[ 72946 = 2 \times 36473 \]
72946 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 109422 |
| Euler totient φ(n) | 36472 |
| Square | 5321118916 |
| Cube | 388154340446536 |
| Square root | 270.085172 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 125 |
| Scientific notation | 7.2946 × |
72946 in other forms
| Form | Value |
|---|---|
| In words | seventy-two thousand nine hundred and forty-six |
| Binary (base 2) | 10001110011110010 |
| Octal (base 8) | 216362 |
| Hexadecimal (base 16) | 11CF2 |
| Base 3 | 10201001201 |
| As time | 72946 seconds = 20 h 15 min 46 s |
Is 72946 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (72946 ÷ 2 = 36473) | 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 | No (remainder 1) | 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 | 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 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 6) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | 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 72946 a prime number?
No. 72946 = 2 × 36473, so it is divisible by 2.
What are the factors of 72946?
1, 2, 36473, 72946.
What is 72946 in binary?
10001110011110010 (hexadecimal 11CF2, octal 216362).
What is the square root of 72946?
About 270.0852.
Is 72946 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 72946?
72946 is a semiprime: 2 × 36473, the product of two primes.