Sudan is about 64 times bigger than Solomon Islands.

Solomon Islands is approximately 28,896 sq km, while Sudan is approximately 1,861,484 sq km, making Sudan 6,342% larger than Solomon Islands. Meanwhile, the population of Solomon Islands is ~702,694 people (47.3 million more people live in Sudan).
Tip: This to-scale comparison of Solomon Islands vs. Sudan uses the Mercator projection, which distorts the size of regions near the poles.