6878989 has 4 divisors (see below), whose sum is σ = 7408156. Its totient is φ = 6349824.

The previous prime is 6878983. The next prime is 6879013. The reversal of 6878989 is 9898786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3204100 + 3674889 = 1790^2 + 1917^2 .

It is not a de Polignac number, because 6878989 - 2³ = 6878981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6878981) 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, 264564 + ... + 264589.

It is an arithmetic number, because the mean of its divisors is an integer number (1852039).

Almost surely, 2^6878989 is an apocalyptic number.

It is an amenable number.

6878989 is a deficient number, since it is larger than the sum of its proper divisors (529167).

6878989 is a wasteful number, since it uses less digits than its factorization.

6878989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529166.

The product of its digits is 1741824, while the sum is 55.

The square root of 6878989 is about 2622.7826825721. The cubic root of 6878989 is about 190.1843916304.

The spelling of 6878989 in words is "six million, eight hundred seventy-eight thousand, nine hundred eighty-nine".