6806781 has 32 divisors (see below), whose sum is σ = 10725120. Its totient is φ = 4257792.

The previous prime is 6806777. The next prime is 6806791. The reversal of 6806781 is 1876086.

It is not a de Polignac number, because 6806781 - 2² = 6806777 is a prime.

It is a super-2 number, since 2×6806781² = 92664535163922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6806711) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 60181 + ... + 60293.

It is an arithmetic number, because the mean of its divisors is an integer number (335160).

Almost surely, 2^6806781 is an apocalyptic number.

It is an amenable number.

6806781 is a deficient number, since it is larger than the sum of its proper divisors (3918339).

6806781 is a wasteful number, since it uses less digits than its factorization.

6806781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 6806781 is about 2608.9808354988. The cubic root of 6806781 is about 189.5166012797.

The spelling of 6806781 in words is "six million, eight hundred six thousand, seven hundred eighty-one".