685809268 has 12 divisors (see below), whose sum is σ = 1200384612. Its totient is φ = 342842240.

The previous prime is 685809263. The next prime is 685809277. The reversal of 685809268 is 862908586.

It can be written as a sum of positive squares in 2 ways, for example, as 310534884 + 375274384 = 17622^2 + 19372^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685809263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16446 + ... + 40522.

It is an arithmetic number, because the mean of its divisors is an integer number (100032051).

Almost surely, 2^685809268 is an apocalyptic number.

It is an amenable number.

685809268 is a deficient number, since it is larger than the sum of its proper divisors (514575344).

685809268 is a wasteful number, since it uses less digits than its factorization.

685809268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31202 (or 31200 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 52.

The square root of 685809268 is about 26187.9603634953. The cubic root of 685809268 is about 881.8629901861.

The spelling of 685809268 in words is "six hundred eighty-five million, eight hundred nine thousand, two hundred sixty-eight".