684667794672 has 120 divisors (see below), whose sum is σ = 2017236940160. Its totient is φ = 216181975680.

The previous prime is 684667794659. The next prime is 684667794677. The reversal of 684667794672 is 276497766486.

684667794672 is a `hidden beast` number, since 6 + 8 + 466 + 7 + 7 + 94 + 6 + 72 = 666.

It is a super-2 number, since 2×684667794672² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 684667794672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684667794677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30870147 + ... + 30892317.

Almost surely, 2^684667794672 is an apocalyptic number.

It is an amenable number.

684667794672 is an abundant number, since it is smaller than the sum of its proper divisors (1332569145488).

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

684667794672 is a wasteful number, since it uses less digits than its factorization.

684667794672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33491 (or 33482 counting only the distinct ones).

The product of its digits is 1024192512, while the sum is 72.

The spelling of 684667794672 in words is "six hundred eighty-four billion, six hundred sixty-seven million, seven hundred ninety-four thousand, six hundred seventy-two".