6778778776 has 96 divisors (see below), whose sum is σ = 16830996480. Its totient is φ = 2526216000.

The previous prime is 6778778767. The next prime is 6778778777.

6778778776 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6778778777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65001 + ... + 133351.

It is an arithmetic number, because the mean of its divisors is an integer number (175322880).

Almost surely, 2^6778778776 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 6778778776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8415498240).

6778778776 is an abundant number, since it is smaller than the sum of its proper divisors (10052217704).

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

6778778776 is a wasteful number, since it uses less digits than its factorization.

6778778776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68405 (or 68394 counting only the distinct ones).

The product of its digits is 271063296, while the sum is 70.

The square root of 6778778776 is about 82333.3393954114. The cubic root of 6778778776 is about 1892.5636175868.

The spelling of 6778778776 in words is "six billion, seven hundred seventy-eight million, seven hundred seventy-eight thousand, seven hundred seventy-six".