687208613 has 8 divisors (see below), whose sum is σ = 845795328. Its totient is φ = 543725424.

The previous prime is 687208609. The next prime is 687208631. The reversal of 687208613 is 316802786.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687208613 - 2² = 687208609 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687208603) 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 7 ways as a sum of consecutive naturals, for example, 3775781 + ... + 3775962.

It is an arithmetic number, because the mean of its divisors is an integer number (105724416).

Almost surely, 2^687208613 is an apocalyptic number.

It is an amenable number.

687208613 is a deficient number, since it is larger than the sum of its proper divisors (158586715).

687208613 is a wasteful number, since it uses less digits than its factorization.

687208613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7551763.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 687208613 is about 26214.6640832951. The cubic root of 687208613 is about 882.4623755918.

The spelling of 687208613 in words is "six hundred eighty-seven million, two hundred eight thousand, six hundred thirteen".