685438495824 has 160 divisors (see below), whose sum is σ = 1876360619520. Its totient is φ = 215346733056.

The previous prime is 685438495793. The next prime is 685438495843. The reversal of 685438495824 is 428594834586.

685438495824 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7390024 + ... + 7482200.

It is an arithmetic number, because the mean of its divisors is an integer number (11727253872).

Almost surely, 2^685438495824 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 685438495824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938180309760).

685438495824 is an abundant number, since it is smaller than the sum of its proper divisors (1190922123696).

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

685438495824 is a wasteful number, since it uses less digits than its factorization.

685438495824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92357 (or 92351 counting only the distinct ones).

The product of its digits is 265420800, while the sum is 66.

The spelling of 685438495824 in words is "six hundred eighty-five billion, four hundred thirty-eight million, four hundred ninety-five thousand, eight hundred twenty-four".