685388320 has 96 divisors (see below), whose sum is σ = 1773802800. Its totient is φ = 249102336.

The previous prime is 685388243. The next prime is 685388399. The reversal of 685388320 is 23883586.

It can be written as a sum of positive squares in 8 ways, for example, as 547372816 + 138015504 = 23396^2 + 11748^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74536 + ... + 83224.

Almost surely, 2^685388320 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 685388320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (886901400).

685388320 is an abundant number, since it is smaller than the sum of its proper divisors (1088414480).

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

685388320 is a wasteful number, since it uses less digits than its factorization.

685388320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8750 (or 8742 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 685388320 is about 26179.9220778061. The cubic root of 685388320 is about 881.6825248312.

The spelling of 685388320 in words is "six hundred eighty-five million, three hundred eighty-eight thousand, three hundred twenty".