806720685 has 16 divisors (see below), whose sum is σ = 1315108224. Its totient is φ = 422132672.

The previous prime is 806720641. The next prime is 806720689. The reversal of 806720685 is 586027608.

It is a cyclic number.

It is not a de Polignac number, because 806720685 - 2²³ = 798332077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806720689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 506577 + ... + 508166.

It is an arithmetic number, because the mean of its divisors is an integer number (82194264).

Almost surely, 2^806720685 is an apocalyptic number.

It is an amenable number.

806720685 is a deficient number, since it is larger than the sum of its proper divisors (508387539).

806720685 is a wasteful number, since it uses less digits than its factorization.

806720685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014804.

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 806720685 is about 28402.8288203834. The cubic root of 806720685 is about 930.9100757169.

The spelling of 806720685 in words is "eight hundred six million, seven hundred twenty thousand, six hundred eighty-five".