685445816 has 32 divisors (see below), whose sum is σ = 1463011200. Its totient is φ = 298019040.

The previous prime is 685445801. The next prime is 685445819. The reversal of 685445816 is 618544586.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685445819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167306 + ... + 171353.

It is an arithmetic number, because the mean of its divisors is an integer number (45719100).

Almost surely, 2^685445816 is an apocalyptic number.

It is an amenable number.

685445816 is an abundant number, since it is smaller than the sum of its proper divisors (777565384).

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

685445816 is a wasteful number, since it uses less digits than its factorization.

685445816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338699 (or 338695 counting only the distinct ones).

The product of its digits is 921600, while the sum is 47.

The square root of 685445816 is about 26181.0201481913. The cubic root of 685445816 is about 881.7071783984.

The spelling of 685445816 in words is "six hundred eighty-five million, four hundred forty-five thousand, eight hundred sixteen".