687605 has 8 divisors (see below), whose sum is σ = 833112. Its totient is φ = 544768.

The previous prime is 687593. The next prime is 687623. The reversal of 687605 is 506786.

It can be written as a sum of positive squares in 4 ways, for example, as 5329 + 682276 = 73^2 + 826^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 687605 - 2⁶ = 687541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44 + ... + 1173.

It is an arithmetic number, because the mean of its divisors is an integer number (104139).

2⁶⁸⁷⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

687605 is a deficient number, since it is larger than the sum of its proper divisors (145507).

687605 is a wasteful number, since it uses less digits than its factorization.

687605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 687605 is about 829.2195125538. The cubic root of 687605 is about 88.2632013250.

The spelling of 687605 in words is "six hundred eighty-seven thousand, six hundred five".