6778899 has 12 divisors (see below), whose sum is σ = 10031112. Its totient is φ = 4408800.

The previous prime is 6778861. The next prime is 6778921. The reversal of 6778899 is 9988776.

It is not a de Polignac number, because 6778899 - 2⁸ = 6778643 is a prime.

6778899 is a lucky number.

It is a plaindrome in base 10.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (6778829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8817 + ... + 9554.

It is an arithmetic number, because the mean of its divisors is an integer number (835926).

Almost surely, 2^6778899 is an apocalyptic number.

6778899 is a deficient number, since it is larger than the sum of its proper divisors (3252213).

6778899 is a wasteful number, since it uses less digits than its factorization.

6778899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18418 (or 18415 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 6778899 is about 2603.6318864233. The cubic root of 6778899 is about 189.2574805945.

The spelling of 6778899 in words is "six million, seven hundred seventy-eight thousand, eight hundred ninety-nine".