685490910 has 128 divisors (see below), whose sum is σ = 1861816320. Its totient is φ = 160525440.

The previous prime is 685490909. The next prime is 685490921. The reversal of 685490910 is 19094586.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11618461 + ... + 11618519.

It is an arithmetic number, because the mean of its divisors is an integer number (14545440).

Almost surely, 2^685490910 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685490910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (930908160).

685490910 is an abundant number, since it is smaller than the sum of its proper divisors (1176325410).

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

685490910 is a wasteful number, since it uses less digits than its factorization.

685490910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 685490910 is about 26181.8813304163. The cubic root of 685490910 is about 881.7265131781.

The spelling of 685490910 in words is "six hundred eighty-five million, four hundred ninety thousand, nine hundred ten".