9788066778 has 32 divisors (see below), whose sum is σ = 23688768384. Its totient is φ = 2632084992.

The previous prime is 9788066773. The next prime is 9788066797. The reversal of 9788066778 is 8776608879.

9788066778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (9788066773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6853675 + ... + 6855102.

It is an arithmetic number, because the mean of its divisors is an integer number (740274012).

Almost surely, 2^9788066778 is an apocalyptic number.

9788066778 is an abundant number, since it is smaller than the sum of its proper divisors (13900701606).

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

9788066778 is a wasteful number, since it uses less digits than its factorization.

9788066778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13708806.

The product of its (nonzero) digits is 56899584, while the sum is 66.

The square root of 9788066778 is about 98934.6591341983. The cubic root of 9788066778 is about 2139.1060098212.

The spelling of 9788066778 in words is "nine billion, seven hundred eighty-eight million, sixty-six thousand, seven hundred seventy-eight".