This infographic created by Hubspot studied 1.5 million photos from 538, 270 users.
Like I already mentioned in my previous post “How to get your picture to Instagram Top Posts” the more hashtags the better. I would recommend using the Instagram cap of 30 hashtags per photo. This is a way to really get your photo or video to go viral on Instagram because you have 30 times more likelihood of being in the popular section of one or more of your chosen hashtags. To make it look less spammy, I would hashtag in a future comment rather than in the initial caption.