Three Cheers !! Which is the fourth?

The numbers are all Triperfect numbers.

A triperfect number is a positive integer $n$ such that the sum of its divisors is equal to 3 times $n$ .

The first six (and the only six known till now) triperfect numbers are

$120$ ,

$672$ ,

$523776$ ,

$459818240$ ,

$1476304896$ ,

$51001180160$ .