685218204 has 144 divisors (see below), whose sum is σ = 2063268480. Its totient is φ = 196655040.

The previous prime is 685218187. The next prime is 685218211. The reversal of 685218204 is 402812586.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 201462 + ... + 204834.

Almost surely, 2^685218204 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 685218204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1031634240).

685218204 is an abundant number, since it is smaller than the sum of its proper divisors (1378050276).

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

685218204 is a wasteful number, since it uses less digits than its factorization.

685218204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3422 (or 3408 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 685218204 is about 26176.6728978302. The cubic root of 685218204 is about 881.6095731380.

The spelling of 685218204 in words is "six hundred eighty-five million, two hundred eighteen thousand, two hundred four".