685790208 has 66 divisors (see below), whose sum is σ = 1980230954. Its totient is φ = 228593664.

The previous prime is 685790167. The next prime is 685790213. The reversal of 685790208 is 802097586.

It can be written as a sum of positive squares in only one way, i.e., 589906944 + 95883264 = 24288^2 + 9792^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27991 + ... + 46422.

Almost surely, 2^685790208 is an apocalyptic number.

It is an amenable number.

685790208 is an abundant number, since it is smaller than the sum of its proper divisors (1294440746).

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

685790208 is a wasteful number, since it uses less digits than its factorization.

685790208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74439 (or 74418 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 685790208 is about 26187.5964532830. The cubic root of 685790208 is about 881.8548205365.

The spelling of 685790208 in words is "six hundred eighty-five million, seven hundred ninety thousand, two hundred eight".