6778979 has 4 divisors (see below), whose sum is σ = 6790584. Its totient is φ = 6767376.

The previous prime is 6778973. The next prime is 6779023. The reversal of 6778979 is 9798776.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6778979 - 2⁴ = 6778963 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 6778979.

It is not an unprimeable number, because it can be changed into a prime (6778973) 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, 4877 + ... + 6110.

It is an arithmetic number, because the mean of its divisors is an integer number (1697646).

Almost surely, 2^6778979 is an apocalyptic number.

6778979 is a deficient number, since it is larger than the sum of its proper divisors (11605).

6778979 is a wasteful number, since it uses less digits than its factorization.

6778979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11604.

The product of its digits is 1333584, while the sum is 53.

The square root of 6778979 is about 2603.6472495329. The cubic root of 6778979 is about 189.2582250880.

The spelling of 6778979 in words is "six million, seven hundred seventy-eight thousand, nine hundred seventy-nine".