6778647 has 20 divisors (see below), whose sum is σ = 10323720. Its totient is φ = 4431024.

The previous prime is 6778643. The next prime is 6778661. The reversal of 6778647 is 7468776.

It is not a de Polignac number, because 6778647 - 2² = 6778643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6778643) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3504 + ... + 5082.

It is an arithmetic number, because the mean of its divisors is an integer number (516186).

Almost surely, 2^6778647 is an apocalyptic number.

6778647 is a deficient number, since it is larger than the sum of its proper divisors (3545073).

6778647 is a wasteful number, since it uses less digits than its factorization.

6778647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644 (or 1635 counting only the distinct ones).

The product of its digits is 395136, while the sum is 45.

The square root of 6778647 is about 2603.5834920355. The cubic root of 6778647 is about 189.2551354017.

The spelling of 6778647 in words is "six million, seven hundred seventy-eight thousand, six hundred forty-seven".