# C Exercises: Find largest prime factor of 438927456

## C Programming Challenges: Exercise-19 with Solution

The prime factors of 13195 are 5, 7, 13, 29.

Write a C program to find the largest prime factor of the number 438927456.

**C Code:**

```
#include <stdio.h>
int main(void)
{
unsigned long long n = 438927456L;
unsigned long long i;
for (i = 2ULL; i < n; i++) {
//1ULL is 'unsigned long long
while (n % i == 0) {
n /= i;
}
}
printf("%llu\n", n);
return 0;
}
```

Sample Output:

415651

**Flowchart:**

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