687343647589 has 4 divisors (see below), whose sum is σ = 698611576300. Its totient is φ = 676075718880.

The previous prime is 687343647587. The next prime is 687343647623. The reversal of 687343647589 is 985746343786.

687343647589 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 396112890625 + 291230756964 = 629375^2 + 539658^2 .

It is a cyclic number.

It is not a de Polignac number, because 687343647589 - 2¹ = 687343647587 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 (687343647583) 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, 5633964264 + ... + 5633964385.

It is an arithmetic number, because the mean of its divisors is an integer number (174652894075).

Almost surely, 2^687343647589 is an apocalyptic number.

It is an amenable number.

687343647589 is a deficient number, since it is larger than the sum of its proper divisors (11267928711).

687343647589 is a wasteful number, since it uses less digits than its factorization.

687343647589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11267928710.

The product of its digits is 731566080, while the sum is 70.

The spelling of 687343647589 in words is "six hundred eighty-seven billion, three hundred forty-three million, six hundred forty-seven thousand, five hundred eighty-nine".