6811978 has 8 divisors (see below), whose sum is σ = 10261440. Its totient is φ = 3391500.

The previous prime is 6811967. The next prime is 6811993. The reversal of 6811978 is 8791186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6811978.

It is an unprimeable number.

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, 6648 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (1282680).

Almost surely, 2^6811978 is an apocalyptic number.

6811978 is a deficient number, since it is larger than the sum of its proper divisors (3449462).

6811978 is a wasteful number, since it uses less digits than its factorization.

6811978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14492.

The product of its digits is 24192, while the sum is 40.

The square root of 6811978 is about 2609.9766282478. The cubic root of 6811978 is about 189.5648211955.

The spelling of 6811978 in words is "six million, eight hundred eleven thousand, nine hundred seventy-eight".