687670 has 8 divisors (see below), whose sum is σ = 1237824. Its totient is φ = 275064.

The previous prime is 687647. The next prime is 687679. The reversal of 687670 is 76786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687679) 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, 34374 + ... + 34393.

It is an arithmetic number, because the mean of its divisors is an integer number (154728).

2⁶⁸⁷⁶⁷⁰ is an apocalyptic number.

687670 is a deficient number, since it is larger than the sum of its proper divisors (550154).

687670 is a wasteful number, since it uses less digits than its factorization.

687670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68774.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 687670 is about 829.2587051096. The cubic root of 687670 is about 88.2659824408.

The spelling of 687670 in words is "six hundred eighty-seven thousand, six hundred seventy".