6809978 has 16 divisors (see below), whose sum is σ = 12182400. Its totient is φ = 2791536.

The previous prime is 6809927. The next prime is 6809981. The reversal of 6809978 is 8799086.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10253 + ... + 10896.

It is an arithmetic number, because the mean of its divisors is an integer number (761400).

Almost surely, 2^6809978 is an apocalyptic number.

6809978 is a deficient number, since it is larger than the sum of its proper divisors (5372422).

6809978 is a wasteful number, since it uses less digits than its factorization.

6809978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21181.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 6809978 is about 2609.5934549274. The cubic root of 6809978 is about 189.5462672722.

The spelling of 6809978 in words is "six million, eight hundred nine thousand, nine hundred seventy-eight".