684484878 has 64 divisors (see below), whose sum is σ = 1723783680. Its totient is φ = 176016000.

The previous prime is 684484841. The next prime is 684484903. The reversal of 684484878 is 878484486.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39328 + ... + 53996.

It is an arithmetic number, because the mean of its divisors is an integer number (26934120).

Almost surely, 2^684484878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684484878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861891840).

684484878 is an abundant number, since it is smaller than the sum of its proper divisors (1039298802).

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

684484878 is a wasteful number, since it uses less digits than its factorization.

684484878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14793.

The product of its digits is 11010048, while the sum is 57.

The square root of 684484878 is about 26162.6619058535. The cubic root of 684484878 is about 881.2949590060.

The spelling of 684484878 in words is "six hundred eighty-four million, four hundred eighty-four thousand, eight hundred seventy-eight".