684323784 has 96 divisors (see below), whose sum is σ = 1981324800. Its totient is φ = 212847360.

The previous prime is 684323771. The next prime is 684323813. The reversal of 684323784 is 487323486.

684323784 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62857 + ... + 72935.

It is an arithmetic number, because the mean of its divisors is an integer number (20638800).

Almost surely, 2^684323784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684323784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (990662400).

684323784 is an abundant number, since it is smaller than the sum of its proper divisors (1297001016).

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

684323784 is a wasteful number, since it uses less digits than its factorization.

684323784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10155 (or 10148 counting only the distinct ones).

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

The square root of 684323784 is about 26159.5830241998. The cubic root of 684323784 is about 881.2258157842.

The spelling of 684323784 in words is "six hundred eighty-four million, three hundred twenty-three thousand, seven hundred eighty-four".