687009 has 4 divisors (see below), whose sum is σ = 916016. Its totient is φ = 458004.

The previous prime is 687007. The next prime is 687013. The reversal of 687009 is 900786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 687009 - 2¹ = 687007 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687009.

It is not an unprimeable number, because it can be changed into a prime (687007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114499 + ... + 114504.

It is an arithmetic number, because the mean of its divisors is an integer number (229004).

2⁶⁸⁷⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

687009 is a deficient number, since it is larger than the sum of its proper divisors (229007).

687009 is a wasteful number, since it uses less digits than its factorization.

687009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229006.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 687009 is about 828.8600605651. The cubic root of 687009 is about 88.2376924577.

The spelling of 687009 in words is "six hundred eighty-seven thousand, nine".