7776116778 has 32 divisors (see below), whose sum is σ = 16550702784. Its totient is φ = 2427176192.

The previous prime is 7776116749. The next prime is 7776116837. The reversal of 7776116778 is 8776116777.

It is a happy number.

It is an unprimeable number.

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, 173400 + ... + 213587.

It is an arithmetic number, because the mean of its divisors is an integer number (517209462).

Almost surely, 2^7776116778 is an apocalyptic number.

7776116778 is an abundant number, since it is smaller than the sum of its proper divisors (8774586006).

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

7776116778 is a wasteful number, since it uses less digits than its factorization.

7776116778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387206.

The product of its digits is 4840416, while the sum is 57.

The square root of 7776116778 is about 88182.2928824149. The cubic root of 7776116778 is about 1981.1662667887.

Subtracting 7776116778 from its reverse (8776116777), we obtain a palindrome (999999999).

The spelling of 7776116778 in words is "seven billion, seven hundred seventy-six million, one hundred sixteen thousand, seven hundred seventy-eight".