6778009 has 8 divisors (see below), whose sum is σ = 7823808. Its totient is φ = 5751600.

The previous prime is 6777989. The next prime is 6778021. The reversal of 6778009 is 9008776.

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

It is a cyclic number.

It is not a de Polignac number, because 6778009 - 2⁹ = 6777497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6778039) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4087 + ... + 5500.

It is an arithmetic number, because the mean of its divisors is an integer number (977976).

Almost surely, 2^6778009 is an apocalyptic number.

It is an amenable number.

6778009 is a deficient number, since it is larger than the sum of its proper divisors (1045799).

6778009 is a wasteful number, since it uses less digits than its factorization.

6778009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9695.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 6778009 is about 2603.4609657147. The cubic root of 6778009 is about 189.2491977092.

The spelling of 6778009 in words is "six million, seven hundred seventy-eight thousand, nine".