687676585 has 4 divisors (see below), whose sum is σ = 825211908. Its totient is φ = 550141264.

The previous prime is 687676523. The next prime is 687676589. The reversal of 687676585 is 585676786.

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 308634624 + 379041961 = 17568^2 + 19469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687676585 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687676589) 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, 68767654 + ... + 68767663.

It is an arithmetic number, because the mean of its divisors is an integer number (206302977).

Almost surely, 2^687676585 is an apocalyptic number.

It is an amenable number.

687676585 is a deficient number, since it is larger than the sum of its proper divisors (137535323).

687676585 is a wasteful number, since it uses less digits than its factorization.

687676585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137535322.

The product of its digits is 16934400, while the sum is 58.

The square root of 687676585 is about 26223.5883318817. The cubic root of 687676585 is about 882.6626417945.

The spelling of 687676585 in words is "six hundred eighty-seven million, six hundred seventy-six thousand, five hundred eighty-five".