685193686 has 4 divisors (see below), whose sum is σ = 1027790532. Its totient is φ = 342596842.

The previous prime is 685193669. The next prime is 685193737. The reversal of 685193686 is 686391586.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 171298420 + ... + 171298423.

It is an arithmetic number, because the mean of its divisors is an integer number (256947633).

Almost surely, 2^685193686 is an apocalyptic number.

685193686 is a deficient number, since it is larger than the sum of its proper divisors (342596846).

685193686 is a wasteful number, since it uses less digits than its factorization.

685193686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342596845.

The product of its digits is 1866240, while the sum is 52.

The square root of 685193686 is about 26176.2045759121. The cubic root of 685193686 is about 881.5990579662.

The spelling of 685193686 in words is "six hundred eighty-five million, one hundred ninety-three thousand, six hundred eighty-six".