6778881 has 12 divisors (see below), whose sum is σ = 10056852. Its totient is φ = 4396896.

The previous prime is 6778861. The next prime is 6778921. The reversal of 6778881 is 1888776.

6778881 is digitally balanced in base 3, 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 5130225 + 1648656 = 2265^2 + 1284^2 .

It is not a de Polignac number, because 6778881 - 2¹⁹ = 6254593 is a prime.

It is a super-2 number, since 2×6778881² = 91906455224322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6778831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9846 + ... + 10511.

It is an arithmetic number, because the mean of its divisors is an integer number (838071).

It is a Proth number, since it is equal to 1655 ⋅ 2¹² + 1 and 1655 < 2¹².

Almost surely, 2^6778881 is an apocalyptic number.

It is an amenable number.

6778881 is a deficient number, since it is larger than the sum of its proper divisors (3277971).

6778881 is a wasteful number, since it uses less digits than its factorization.

6778881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20400 (or 20397 counting only the distinct ones).

The product of its digits is 150528, while the sum is 45.

The square root of 6778881 is about 2603.6284297111. The cubic root of 6778881 is about 189.2573130827.

The spelling of 6778881 in words is "six million, seven hundred seventy-eight thousand, eight hundred eighty-one".