6778761864 has 32 divisors (see below), whose sum is σ = 19367891520. Its totient is φ = 1936789056.

The previous prime is 6778761817. The next prime is 6778761877. The reversal of 6778761864 is 4681678776.

It is a super-2 number, since 2×6778761864² = 91903224817641508992, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 6778761798 and 6778761807.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20174719 + ... + 20175054.

It is an arithmetic number, because the mean of its divisors is an integer number (605246610).

Almost surely, 2^6778761864 is an apocalyptic number.

It is an amenable number.

6778761864 is an abundant number, since it is smaller than the sum of its proper divisors (12589129656).

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

6778761864 is a wasteful number, since it uses less digits than its factorization.

6778761864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40349789 (or 40349785 counting only the distinct ones).

The product of its digits is 18966528, while the sum is 60.

The square root of 6778761864 is about 82333.2366909014. The cubic root of 6778761864 is about 1892.5620437014.

The spelling of 6778761864 in words is "six billion, seven hundred seventy-eight million, seven hundred sixty-one thousand, eight hundred sixty-four".