684676404 has 18 divisors (see below), whose sum is σ = 1730709890. Its totient is φ = 228225456.

The previous prime is 684676387. The next prime is 684676409. The reversal of 684676404 is 404676486.

684676404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 474368400 + 210308004 = 21780^2 + 14502^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 684676404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684676409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9509359 + ... + 9509430.

Almost surely, 2^684676404 is an apocalyptic number.

It is an amenable number.

684676404 is an abundant number, since it is smaller than the sum of its proper divisors (1046033486).

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

684676404 is a wasteful number, since it uses less digits than its factorization.

684676404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19018799 (or 19018794 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The square root of 684676404 is about 26166.3219425276. The cubic root of 684676404 is about 881.3771498442.

The spelling of 684676404 in words is "six hundred eighty-four million, six hundred seventy-six thousand, four hundred four".