685259647 has 16 divisors (see below), whose sum is σ = 770895360. Its totient is φ = 605864448.

The previous prime is 685259633. The next prime is 685259651. The reversal of 685259647 is 746952586.

It is a cyclic number.

It is not a de Polignac number, because 685259647 - 2²⁷ = 551041919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685259594 and 685259603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685259657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 543 + ... + 37024.

It is an arithmetic number, because the mean of its divisors is an integer number (48180960).

Almost surely, 2^685259647 is an apocalyptic number.

685259647 is a deficient number, since it is larger than the sum of its proper divisors (85635713).

685259647 is a wasteful number, since it uses less digits than its factorization.

685259647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37650.

The product of its digits is 3628800, while the sum is 52.

The square root of 685259647 is about 26177.4644876084. The cubic root of 685259647 is about 881.6273464589.

The spelling of 685259647 in words is "six hundred eighty-five million, two hundred fifty-nine thousand, six hundred forty-seven".