6778855 has 4 divisors (see below), whose sum is σ = 8134632. Its totient is φ = 5423080.

The previous prime is 6778841. The next prime is 6778861. The reversal of 6778855 is 5588776.

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

It is not a de Polignac number, because 6778855 - 2⁵ = 6778823 is a prime.

It is a super-2 number, since 2×6778855² = 91905750222050, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 677881 + ... + 677890.

It is an arithmetic number, because the mean of its divisors is an integer number (2033658).

Almost surely, 2^6778855 is an apocalyptic number.

6778855 is a deficient number, since it is larger than the sum of its proper divisors (1355777).

6778855 is a wasteful number, since it uses less digits than its factorization.

6778855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355776.

The product of its digits is 470400, while the sum is 46.

The square root of 6778855 is about 2603.6234366744. The cubic root of 6778855 is about 189.2570711206.

The spelling of 6778855 in words is "six million, seven hundred seventy-eight thousand, eight hundred fifty-five".