6806689394 has 8 divisors (see below), whose sum is σ = 10220116140. Its totient is φ = 3399984016.

The previous prime is 6806689387. The next prime is 6806689397. The reversal of 6806689394 is 4939866086.

It can be written as a sum of positive squares in 2 ways, for example, as 6367242025 + 439447369 = 79795^2 + 20963^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (6806689397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1677809 + ... + 1681860.

Almost surely, 2^6806689394 is an apocalyptic number.

6806689394 is a deficient number, since it is larger than the sum of its proper divisors (3413426746).

6806689394 is a wasteful number, since it uses less digits than its factorization.

6806689394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3360684.

The product of its (nonzero) digits is 13436928, while the sum is 59.

The square root of 6806689394 is about 82502.6629509618. The cubic root of 6806689394 is about 1895.1575110127.

The spelling of 6806689394 in words is "six billion, eight hundred six million, six hundred eighty-nine thousand, three hundred ninety-four".