685324765 has 4 divisors (see below), whose sum is σ = 822389724. Its totient is φ = 548259808.

The previous prime is 685324751. The next prime is 685324769. The reversal of 685324765 is 567423586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111386916 + 573937849 = 10554^2 + 23957^2 .

It is a cyclic number.

It is not a de Polignac number, because 685324765 - 2⁵ = 685324733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685324769) 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 3 ways as a sum of consecutive naturals, for example, 68532472 + ... + 68532481.

It is an arithmetic number, because the mean of its divisors is an integer number (205597431).

Almost surely, 2^685324765 is an apocalyptic number.

It is an amenable number.

685324765 is a deficient number, since it is larger than the sum of its proper divisors (137064959).

685324765 is a wasteful number, since it uses less digits than its factorization.

685324765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137064958.

The product of its digits is 1209600, while the sum is 46.

The square root of 685324765 is about 26178.7082378027. The cubic root of 685324765 is about 881.6552716360.

The spelling of 685324765 in words is "six hundred eighty-five million, three hundred twenty-four thousand, seven hundred sixty-five".