6878644 has 12 divisors (see below), whose sum is σ = 12203044. Its totient is φ = 3392064.

The previous prime is 6878639. The next prime is 6878647. The reversal of 6878644 is 4468786.

It can be written as a sum of positive squares in 2 ways, for example, as 1299600 + 5579044 = 1140^2 + 2362^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6878644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6878647) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11487 + ... + 12070.

Almost surely, 2^6878644 is an apocalyptic number.

It is an amenable number.

6878644 is a deficient number, since it is larger than the sum of its proper divisors (5324400).

6878644 is a wasteful number, since it uses less digits than its factorization.

6878644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23634 (or 23632 counting only the distinct ones).

The product of its digits is 258048, while the sum is 43.

The square root of 6878644 is about 2622.7169119064. The cubic root of 6878644 is about 190.1812121558.

The spelling of 6878644 in words is "six million, eight hundred seventy-eight thousand, six hundred forty-four".