6778660 has 36 divisors (see below), whose sum is σ = 16561692. Its totient is φ = 2323776.

The previous prime is 6778643. The next prime is 6778661. The reversal of 6778660 is 668776.

6778660 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 3415104 + 3363556 = 1848^2 + 1834^2 .

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (6778661) 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 11 ways as a sum of consecutive naturals, for example, 2479 + ... + 4438.

It is an arithmetic number, because the mean of its divisors is an integer number (460047).

Almost surely, 2^6778660 is an apocalyptic number.

It is an amenable number.

6778660 is an abundant number, since it is smaller than the sum of its proper divisors (9783032).

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

6778660 is a wasteful number, since it uses less digits than its factorization.

6778660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6940 (or 6931 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 6778660 is about 2603.5859885934. The cubic root of 6778660 is about 189.2552563853.

The spelling of 6778660 in words is "six million, seven hundred seventy-eight thousand, six hundred sixty".