685385064 has 320 divisors, whose sum is σ = 2414966400. Its totient is φ = 176795136.

The previous prime is 685385059. The next prime is 685385089. The reversal of 685385064 is 460583586.

685385064 is a `hidden beast` number, since 6 + 8 + 538 + 50 + 64 = 666.

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 79 ways as a sum of consecutive naturals, for example, 3479014 + ... + 3479210.

It is an arithmetic number, because the mean of its divisors is an integer number (7546770).

Almost surely, 2^685385064 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 685385064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1207483200).

685385064 is an abundant number, since it is smaller than the sum of its proper divisors (1729581336).

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

685385064 is a wasteful number, since it uses less digits than its factorization.

685385064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The square root of 685385064 is about 26179.8598926732. The cubic root of 685385064 is about 881.6811286578.

The spelling of 685385064 in words is "six hundred eighty-five million, three hundred eighty-five thousand, sixty-four".