6978789 has 12 divisors (see below), whose sum is σ = 10673676. Its totient is φ = 4378752.

The previous prime is 6978779. The next prime is 6978793. The reversal of 6978789 is 9878796.

It can be written as a sum of positive squares in 2 ways, for example, as 2377764 + 4601025 = 1542^2 + 2145^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6978789 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6978709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22654 + ... + 22959.

It is an arithmetic number, because the mean of its divisors is an integer number (889473).

Almost surely, 2^6978789 is an apocalyptic number.

It is an amenable number.

6978789 is a deficient number, since it is larger than the sum of its proper divisors (3694887).

6978789 is a wasteful number, since it uses less digits than its factorization.

6978789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45636 (or 45633 counting only the distinct ones).

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

The square root of 6978789 is about 2641.7397676531. The cubic root of 6978789 is about 191.0997076329.

The spelling of 6978789 in words is "six million, nine hundred seventy-eight thousand, seven hundred eighty-nine".