6778091 has 4 divisors (see below), whose sum is σ = 6783672. Its totient is φ = 6772512.

The previous prime is 6778073. The next prime is 6778099. The reversal of 6778091 is 1908776.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6778091 - 2⁶ = 6778027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6778099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110 + ... + 3683.

It is an arithmetic number, because the mean of its divisors is an integer number (1695918).

Almost surely, 2^6778091 is an apocalyptic number.

6778091 is a deficient number, since it is larger than the sum of its proper divisors (5581).

6778091 is a wasteful number, since it uses less digits than its factorization.

6778091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 6778091 is about 2603.4767139347. The cubic root of 6778091 is about 189.2499608818.

The spelling of 6778091 in words is "six million, seven hundred seventy-eight thousand, ninety-one".