8777777778 has 216 divisors, whose sum is σ = 24491208924. Its totient is φ = 2263726080.

The previous prime is 8777777777. The next prime is 8777777819.

8777777778 is nontrivially palindromic in base 10.

8777777778 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8410173849 + 367603929 = 91707^2 + 19173^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8777777777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 24866050 + ... + 24866402.

Almost surely, 2^8777777778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8777777778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12245604462).

8777777778 is an abundant number, since it is smaller than the sum of its proper divisors (15713431146).

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

8777777778 is a wasteful number, since it uses less digits than its factorization.

8777777778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 609 counting only the distinct ones).

The product of its digits is 368947264, while the sum is 72.

The square root of 8777777778 is about 93689.7954848873. The cubic root of 8777777778 is about 2062.8209207295.

The spelling of 8777777778 in words is "eight billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, seven hundred seventy-eight".