684685556 has 12 divisors (see below), whose sum is σ = 1198438080. Its totient is φ = 342274680.

The previous prime is 684685549. The next prime is 684685559. The reversal of 684685556 is 655586486.

It is a junction number, because it is equal to n+sod(n) for n = 684685498 and 684685507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684685559) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 10565 + ... + 38483.

It is an arithmetic number, because the mean of its divisors is an integer number (99869840).

Almost surely, 2^684685556 is an apocalyptic number.

It is an amenable number.

684685556 is a deficient number, since it is larger than the sum of its proper divisors (513752524).

684685556 is a wasteful number, since it uses less digits than its factorization.

684685556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34054 (or 34052 counting only the distinct ones).

The product of its digits is 6912000, while the sum is 53.

The square root of 684685556 is about 26166.4968232280. The cubic root of 684685556 is about 881.3810769197.

The spelling of 684685556 in words is "six hundred eighty-four million, six hundred eighty-five thousand, five hundred fifty-six".