778590546664 has 128 divisors (see below), whose sum is σ = 1713457152000. Its totient is φ = 324757391616.

The previous prime is 778590546649. The next prime is 778590546683. The reversal of 778590546664 is 466645095877.

It is a self number, because there is not a number n which added to its sum of digits gives 778590546664.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 414804894 + ... + 414806770.

It is an arithmetic number, because the mean of its divisors is an integer number (13386384000).

Almost surely, 2^778590546664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778590546664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (856728576000).

778590546664 is an abundant number, since it is smaller than the sum of its proper divisors (934866605336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

778590546664 is a wasteful number, since it uses less digits than its factorization.

778590546664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735 (or 2731 counting only the distinct ones).

The product of its (nonzero) digits is 304819200, while the sum is 67.

The spelling of 778590546664 in words is "seven hundred seventy-eight billion, five hundred ninety million, five hundred forty-six thousand, six hundred sixty-four".