685681312 has 48 divisors (see below), whose sum is σ = 1403136000. Its totient is φ = 329483520.

The previous prime is 685681289. The next prime is 685681333. The reversal of 685681312 is 213186586.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145489 + ... + 150127.

It is an arithmetic number, because the mean of its divisors is an integer number (29232000).

Almost surely, 2^685681312 is an apocalyptic number.

685681312 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685681312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (701568000).

685681312 is an abundant number, since it is smaller than the sum of its proper divisors (717454688).

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

685681312 is a wasteful number, since it uses less digits than its factorization.

685681312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4829 (or 4821 counting only the distinct ones).

The product of its digits is 69120, while the sum is 40.

The square root of 685681312 is about 26185.5172184931. The cubic root of 685681312 is about 881.8081417589.

The spelling of 685681312 in words is "six hundred eighty-five million, six hundred eighty-one thousand, three hundred twelve".