6866778 has 16 divisors (see below), whose sum is σ = 13811616. Its totient is φ = 2275920.

The previous prime is 6866777. The next prime is 6866789. The reversal of 6866778 is 8776686.

It is not an unprimeable number, because it can be changed into a prime (6866773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2076 + ... + 4247.

It is an arithmetic number, because the mean of its divisors is an integer number (863226).

Almost surely, 2^6866778 is an apocalyptic number.

6866778 is an abundant number, since it is smaller than the sum of its proper divisors (6944838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6866778 is a wasteful number, since it uses less digits than its factorization.

6866778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6509.

The product of its digits is 677376, while the sum is 48.

The square root of 6866778 is about 2620.4537774973. The cubic root of 6866778 is about 190.0717918911.

The spelling of 6866778 in words is "six million, eight hundred sixty-six thousand, seven hundred seventy-eight".