This is the 1844th most frequent Russian word.
огромное
Enormous; huge.
Here, 'огромное' is used to describe the large amount of something, specifically friends.
У него огромное количество друзей.
He has a huge number of friends.
Here, 'огромная' (feminine form of 'огромное') describes the large size of the mountain perceived from afar.
Эта гора кажется огромной издалека.
This mountain seems enormous from a distance.
Here, 'огромное' is used figuratively to emphasize the gratitude expressed.