687047 has 4 divisors (see below), whose sum is σ = 693576. Its totient is φ = 680520.

The previous prime is 687041. The next prime is 687061. The reversal of 687047 is 740786.

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

It is not a de Polignac number, because 687047 - 2⁴ = 687031 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687041) 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, 3104 + ... + 3317.

It is an arithmetic number, because the mean of its divisors is an integer number (173394).

2⁶⁸⁷⁰⁴⁷ is an apocalyptic number.

687047 is a deficient number, since it is larger than the sum of its proper divisors (6529).

687047 is a wasteful number, since it uses less digits than its factorization.

687047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6528.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 687047 is about 828.8829832974. The cubic root of 687047 is about 88.2393193022.

The spelling of 687047 in words is "six hundred eighty-seven thousand, forty-seven".