6978609 has 16 divisors (see below), whose sum is σ = 11279040. Its totient is φ = 4229280.

The previous prime is 6978593. The next prime is 6978613. The reversal of 6978609 is 9068796.

6978609 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6978609 - 2⁴ = 6978593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6978649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11452 + ... + 12045.

It is an arithmetic number, because the mean of its divisors is an integer number (704940).

Almost surely, 2^6978609 is an apocalyptic number.

It is an amenable number.

6978609 is a deficient number, since it is larger than the sum of its proper divisors (4300431).

6978609 is a wasteful number, since it uses less digits than its factorization.

6978609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23517 (or 23511 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 6978609 is about 2641.7056989756. The cubic root of 6978609 is about 191.0980646428.

The spelling of 6978609 in words is "six million, nine hundred seventy-eight thousand, six hundred nine".