684690644908 has 24 divisors (see below), whose sum is σ = 1261327334400. Its totient is φ = 324312980688.

The previous prime is 684690644903. The next prime is 684690644917. The reversal of 684690644908 is 809446096486.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 684690644908.

It is not an unprimeable number, because it can be changed into a prime (684690644903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1670373 + ... + 2039491.

It is an arithmetic number, because the mean of its divisors is an integer number (52555305600).

Almost surely, 2^684690644908 is an apocalyptic number.

It is an amenable number.

684690644908 is a deficient number, since it is larger than the sum of its proper divisors (576636689492).

684690644908 is a wasteful number, since it uses less digits than its factorization.

684690644908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393549 (or 393547 counting only the distinct ones).

The product of its (nonzero) digits is 71663616, while the sum is 64.

The spelling of 684690644908 in words is "six hundred eighty-four billion, six hundred ninety million, six hundred forty-four thousand, nine hundred eight".