776728840668 has 96 divisors (see below), whose sum is σ = 2100162774528. Its totient is φ = 220814438400.

The previous prime is 776728840633. The next prime is 776728840691. The reversal of 776728840668 is 866048827677.

776728840668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 141396 + ... + 1254372.

It is an arithmetic number, because the mean of its divisors is an integer number (21876695568).

Almost surely, 2^776728840668 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 776728840668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1050081387264).

776728840668 is an abundant number, since it is smaller than the sum of its proper divisors (1323433933860).

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

776728840668 is a wasteful number, since it uses less digits than its factorization.

776728840668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113323 (or 1113321 counting only the distinct ones).

The product of its (nonzero) digits is 303464448, while the sum is 69.

The spelling of 776728840668 in words is "seven hundred seventy-six billion, seven hundred twenty-eight million, eight hundred forty thousand, six hundred sixty-eight".