687343647587 has 2 divisors, whose sum is σ = 687343647588. Its totient is φ = 687343647586.

The previous prime is 687343647583. The next prime is 687343647623. The reversal of 687343647587 is 785746343786.

687343647587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687343647587 - 2² = 687343647583 is a prime.

It is not a weakly prime, because it can be changed into another prime (687343647583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343671823793 + 343671823794.

It is an arithmetic number, because the mean of its divisors is an integer number (343671823794).

Almost surely, 2^687343647587 is an apocalyptic number.

687343647587 is a deficient number, since it is larger than the sum of its proper divisors (1).

687343647587 is an equidigital number, since it uses as much as digits as its factorization.

687343647587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 568995840, while the sum is 68.

The spelling of 687343647587 in words is "six hundred eighty-seven billion, three hundred forty-three million, six hundred forty-seven thousand, five hundred eighty-seven".