6813778 has 16 divisors (see below), whose sum is σ = 10523520. Its totient is φ = 3307216.

The previous prime is 6813739. The next prime is 6813797. The reversal of 6813778 is 8773186.

It is a self number, because there is not a number n which added to its sum of digits gives 6813778.

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, 16053 + ... + 16471.

It is an arithmetic number, because the mean of its divisors is an integer number (657720).

Almost surely, 2^6813778 is an apocalyptic number.

6813778 is a deficient number, since it is larger than the sum of its proper divisors (3709742).

6813778 is a wasteful number, since it uses less digits than its factorization.

6813778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641.

The product of its digits is 56448, while the sum is 40.

The square root of 6813778 is about 2610.3214361454. The cubic root of 6813778 is about 189.5815166218.

The spelling of 6813778 in words is "six million, eight hundred thirteen thousand, seven hundred seventy-eight".