778865317120 has 144 divisors (see below), whose sum is σ = 2123717242752. Its totient is φ = 270909562880.

The previous prime is 778865317117. The next prime is 778865317121. The reversal of 778865317120 is 21713568877.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778865317121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 878707 + ... + 1526386.

It is an arithmetic number, because the mean of its divisors is an integer number (14748036408).

Almost surely, 2^778865317120 is an apocalyptic number.

It is an amenable number.

778865317120 is an abundant number, since it is smaller than the sum of its proper divisors (1344851925632).

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

778865317120 is a wasteful number, since it uses less digits than its factorization.

778865317120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2405148 (or 2405134 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 55.

The spelling of 778865317120 in words is "seven hundred seventy-eight billion, eight hundred sixty-five million, three hundred seventeen thousand, one hundred twenty".