688587 has 4 divisors (see below), whose sum is σ = 918120. Its totient is φ = 459056.

The previous prime is 688573. The next prime is 688591. The reversal of 688587 is 785886.

It is a happy number.

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 688587 - 2¹⁹ = 164299 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (688087) 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, 114762 + ... + 114767.

It is an arithmetic number, because the mean of its divisors is an integer number (229530).

2⁶⁸⁸⁵⁸⁷ is an apocalyptic number.

688587 is a deficient number, since it is larger than the sum of its proper divisors (229533).

688587 is a wasteful number, since it uses less digits than its factorization.

688587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229532.

The product of its digits is 107520, while the sum is 42.

The square root of 688587 is about 829.8114243610. The cubic root of 688587 is about 88.3051989037.

It can be divided in two parts, 688 and 587, that added together give a triangular number (1275 = T₅₀).

The spelling of 688587 in words is "six hundred eighty-eight thousand, five hundred eighty-seven".