684909716988 has 48 divisors (see below), whose sum is σ = 1826621646080. Its totient is φ = 195667519104.

The previous prime is 684909716957. The next prime is 684909716999. The reversal of 684909716988 is 889617909486.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360183 + ... + 1224561.

Almost surely, 2^684909716988 is an apocalyptic number.

It is an amenable number.

684909716988 is an abundant number, since it is smaller than the sum of its proper divisors (1141711929092).

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

684909716988 is a wasteful number, since it uses less digits than its factorization.

684909716988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873826 (or 873824 counting only the distinct ones).

The product of its (nonzero) digits is 376233984, while the sum is 75.

The spelling of 684909716988 in words is "six hundred eighty-four billion, nine hundred nine million, seven hundred sixteen thousand, nine hundred eighty-eight".