685040000 has 80 divisors (see below), whose sum is σ = 1705563420. Its totient is φ = 273984000.

The previous prime is 685039997. The next prime is 685040017. The reversal of 685040000 is 40586.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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 9 ways as a sum of consecutive naturals, for example, 75719 + ... + 84281.

Almost surely, 2^685040000 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 685040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (852781710).

685040000 is an abundant number, since it is smaller than the sum of its proper divisors (1020523420).

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

685040000 is an frugal number, since it uses more digits than its factorization.

685040000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8597 (or 8570 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 685040000 is about 26173.2688061694. The cubic root of 685040000 is about 881.5331400773.

Adding to 685040000 its reverse (40586), we get a palindrome (685080586).

The spelling of 685040000 in words is "six hundred eighty-five million, forty thousand".