6778390 has 24 divisors (see below), whose sum is σ = 12467952. Its totient is φ = 2653200.

The previous prime is 6778379. The next prime is 6778397. The reversal of 6778390 is 938776.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6778397) 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 11 ways as a sum of consecutive naturals, for example, 44815 + ... + 44965.

It is an arithmetic number, because the mean of its divisors is an integer number (519498).

Almost surely, 2^6778390 is an apocalyptic number.

6778390 is a deficient number, since it is larger than the sum of its proper divisors (5689562).

6778390 is a wasteful number, since it uses less digits than its factorization.

6778390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 6778390 is about 2603.5341365152. The cubic root of 6778390 is about 189.2527436174.

The spelling of 6778390 in words is "six million, seven hundred seventy-eight thousand, three hundred ninety".