6778889 has 8 divisors (see below), whose sum is σ = 7332360. Its totient is φ = 6230016.

The previous prime is 6778861. The next prime is 6778921. The reversal of 6778889 is 9888776.

It can be written as a sum of positive squares in 4 ways, for example, as 4000000 + 2778889 = 2000^2 + 1667^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-6778889 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6778889.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2327 + ... + 4355.

It is an arithmetic number, because the mean of its divisors is an integer number (916545).

Almost surely, 2^6778889 is an apocalyptic number.

It is an amenable number.

6778889 is a deficient number, since it is larger than the sum of its proper divisors (553471).

6778889 is a wasteful number, since it uses less digits than its factorization.

6778889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299.

The product of its digits is 1354752, while the sum is 53.

The square root of 6778889 is about 2603.6299660282. The cubic root of 6778889 is about 189.2573875324.

It can be divided in two parts, 6778 and 889, that added together give a palindrome (7667).

The spelling of 6778889 in words is "six million, seven hundred seventy-eight thousand, eight hundred eighty-nine".