687347 has 4 divisors (see below), whose sum is σ = 695160. Its totient is φ = 679536.

The previous prime is 687343. The next prime is 687359. The reversal of 687347 is 743786.

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

It is a cyclic number.

It is not a de Polignac number, because 687347 - 2² = 687343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3773 + ... + 3950.

It is an arithmetic number, because the mean of its divisors is an integer number (173790).

2⁶⁸⁷³⁴⁷ is an apocalyptic number.

687347 is a deficient number, since it is larger than the sum of its proper divisors (7813).

687347 is an equidigital number, since it uses as much as digits as its factorization.

687347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7812.

The product of its digits is 28224, while the sum is 35.

The square root of 687347 is about 829.0639299837. The cubic root of 687347 is about 88.2521607060.

The spelling of 687347 in words is "six hundred eighty-seven thousand, three hundred forty-seven".