685240636 has 18 divisors (see below), whose sum is σ = 1225244048. Its totient is φ = 335326200.

The previous prime is 685240631. The next prime is 685240649. The reversal of 685240636 is 636042586.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685240631) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 29940 + ... + 47611.

Almost surely, 2^685240636 is an apocalyptic number.

It is an amenable number.

685240636 is a deficient number, since it is larger than the sum of its proper divisors (540003412).

685240636 is a wasteful number, since it uses less digits than its factorization.

685240636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77649 (or 77600 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 685240636 is about 26177.1013674165. The cubic root of 685240636 is about 881.6191934556.

The spelling of 685240636 in words is "six hundred eighty-five million, two hundred forty thousand, six hundred thirty-six".