6781864 has 16 divisors (see below), whose sum is σ = 12772800. Its totient is φ = 3375792.

The previous prime is 6781843. The next prime is 6781867. The reversal of 6781864 is 4681876.

It is not an unprimeable number, because it can be changed into a prime (6781867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139 + ... + 3685.

It is an arithmetic number, because the mean of its divisors is an integer number (798300).

Almost surely, 2^6781864 is an apocalyptic number.

It is an amenable number.

6781864 is a deficient number, since it is larger than the sum of its proper divisors (5990936).

6781864 is a wasteful number, since it uses less digits than its factorization.

6781864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3792 (or 3788 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 6781864 is about 2604.2012211041. The cubic root of 6781864 is about 189.2850694718.

The spelling of 6781864 in words is "six million, seven hundred eighty-one thousand, eight hundred sixty-four".