6678989 has 4 divisors (see below), whose sum is σ = 6770556. Its totient is φ = 6587424.

The previous prime is 6678979. The next prime is 6679009. The reversal of 6678989 is 9898766.

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 5593225 + 1085764 = 2365^2 + 1042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6678989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6678989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6678929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45674 + ... + 45819.

It is an arithmetic number, because the mean of its divisors is an integer number (1692639).

Almost surely, 2^6678989 is an apocalyptic number.

It is an amenable number.

6678989 is a deficient number, since it is larger than the sum of its proper divisors (91567).

6678989 is an equidigital number, since it uses as much as digits as its factorization.

6678989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91566.

The product of its digits is 1306368, while the sum is 53.

The square root of 6678989 is about 2584.3740054412. The cubic root of 6678989 is about 188.3230920023.

It can be divided in two parts, 6678 and 989, that added together give a palindrome (7667).

The spelling of 6678989 in words is "six million, six hundred seventy-eight thousand, nine hundred eighty-nine".