685362816 has 128 divisors (see below), whose sum is σ = 2056564800. Its totient is φ = 224640000.

The previous prime is 685362757. The next prime is 685362833. The reversal of 685362816 is 618263586.

685362816 is a `hidden beast` number, since 6 + 8 + 5 + 3 + 628 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

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 15 ways as a sum of consecutive naturals, for example, 209191 + ... + 212441.

Almost surely, 2^685362816 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 685362816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1028282400).

685362816 is an abundant number, since it is smaller than the sum of its proper divisors (1371201984).

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

685362816 is a wasteful number, since it uses less digits than its factorization.

685362816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3335 (or 3317 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 685362816 is about 26179.4349824438. The cubic root of 685362816 is about 881.6715885929.

The spelling of 685362816 in words is "six hundred eighty-five million, three hundred sixty-two thousand, eight hundred sixteen".