685613856 has 96 divisors (see below), whose sum is σ = 1877008896. Its totient is φ = 218880000.

The previous prime is 685613833. The next prime is 685613861. The reversal of 685613856 is 658316586.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

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 15 ways as a sum of consecutive naturals, for example, 299436 + ... + 301716.

It is an arithmetic number, because the mean of its divisors is an integer number (19552176).

Almost surely, 2^685613856 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 685613856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938504448).

685613856 is an abundant number, since it is smaller than the sum of its proper divisors (1191395040).

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

685613856 is a wasteful number, since it uses less digits than its factorization.

685613856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426 (or 2418 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 48.

The square root of 685613856 is about 26184.2291465684. The cubic root of 685613856 is about 881.7792239513.

The spelling of 685613856 in words is "six hundred eighty-five million, six hundred thirteen thousand, eight hundred fifty-six".