685065636 has 54 divisors (see below), whose sum is σ = 1745089346. Its totient is φ = 226598400.

The previous prime is 685065631. The next prime is 685065673. The reversal of 685065636 is 636560586.

685065636 is a `hidden beast` number, since 6 + 8 + 5 + 0 + 6 + 5 + 636 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 287302500 + 397763136 = 16950^2 + 19944^2 .

It is a junction number, because it is equal to n+sod(n) for n = 685065591 and 685065600.

It is not an unprimeable number, because it can be changed into a prime (685065631) 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 17 ways as a sum of consecutive naturals, for example, 2437816 + ... + 2438096.

Almost surely, 2^685065636 is an apocalyptic number.

It is an amenable number.

685065636 is an abundant number, since it is smaller than the sum of its proper divisors (1060023710).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685065636 is a wasteful number, since it uses less digits than its factorization.

685065636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The square root of 685065636 is about 26173.7585378944. The cubic root of 685065636 is about 881.5441363703.

The spelling of 685065636 in words is "six hundred eighty-five million, sixty-five thousand, six hundred thirty-six".