684561944272 has 20 divisors (see below), whose sum is σ = 1326642204420. Its totient is φ = 342202665728.

The previous prime is 684561944233. The next prime is 684561944357. The reversal of 684561944272 is 272449165486.

It can be written as a sum of positive squares in 2 ways, for example, as 481463903376 + 203098040896 = 693876^2 + 450664^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4821997 + ... + 4961932.

It is an arithmetic number, because the mean of its divisors is an integer number (66332110221).

Almost surely, 2^684561944272 is an apocalyptic number.

It is an amenable number.

684561944272 is a deficient number, since it is larger than the sum of its proper divisors (642080260148).

684561944272 is a wasteful number, since it uses less digits than its factorization.

684561944272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9788310 (or 9788304 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 58.

The spelling of 684561944272 in words is "six hundred eighty-four billion, five hundred sixty-one million, nine hundred forty-four thousand, two hundred seventy-two".