6778388 has 12 divisors (see below), whose sum is σ = 11880960. Its totient is φ = 3383832.

The previous prime is 6778379. The next prime is 6778397. The reversal of 6778388 is 8838776.

It is an interprime number because it is at equal distance from previous prime (6778379) and next prime (6778397).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3245 + ... + 4907.

It is an arithmetic number, because the mean of its divisors is an integer number (990080).

Almost surely, 2^6778388 is an apocalyptic number.

It is an amenable number.

6778388 is a deficient number, since it is larger than the sum of its proper divisors (5102572).

6778388 is a wasteful number, since it uses less digits than its factorization.

6778388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2686 (or 2684 counting only the distinct ones).

The product of its digits is 451584, while the sum is 47.

The square root of 6778388 is about 2603.5337524219. The cubic root of 6778388 is about 189.2527250041.

The spelling of 6778388 in words is "six million, seven hundred seventy-eight thousand, three hundred eighty-eight".