685755806 has 4 divisors (see below), whose sum is σ = 1028633712. Its totient is φ = 342877902.

The previous prime is 685755793. The next prime is 685755823. The reversal of 685755806 is 608557586.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×685755806² = 940522050925419272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 171438950 + ... + 171438953.

It is an arithmetic number, because the mean of its divisors is an integer number (257158428).

Almost surely, 2^685755806 is an apocalyptic number.

685755806 is a deficient number, since it is larger than the sum of its proper divisors (342877906).

685755806 is a wasteful number, since it uses less digits than its factorization.

685755806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342877905.

The product of its (nonzero) digits is 2016000, while the sum is 50.

The square root of 685755806 is about 26186.9396073692. The cubic root of 685755806 is about 881.8400744929.

The spelling of 685755806 in words is "six hundred eighty-five million, seven hundred fifty-five thousand, eight hundred six".