685679816 has 16 divisors (see below), whose sum is σ = 1288008240. Its totient is φ = 342210960.

The previous prime is 685679803. The next prime is 685679831. The reversal of 685679816 is 618976586.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73970 + ... + 82721.

It is an arithmetic number, because the mean of its divisors is an integer number (80500515).

Almost surely, 2^685679816 is an apocalyptic number.

It is an amenable number.

685679816 is a deficient number, since it is larger than the sum of its proper divisors (602328424).

685679816 is a wasteful number, since it uses less digits than its factorization.

685679816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157244 (or 157240 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 56.

The square root of 685679816 is about 26185.4886530689. The cubic root of 685679816 is about 881.8075004571.

The spelling of 685679816 in words is "six hundred eighty-five million, six hundred seventy-nine thousand, eight hundred sixteen".