687887 has 4 divisors (see below), whose sum is σ = 700920. Its totient is φ = 674856.

The previous prime is 687847. The next prime is 687893. The reversal of 687887 is 788786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788786 = 2 ⋅394393.

It is a cyclic number.

It is not a de Polignac number, because 687887 - 2⁶ = 687823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687847) 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, 6437 + ... + 6542.

It is an arithmetic number, because the mean of its divisors is an integer number (175230).

2⁶⁸⁷⁸⁸⁷ is an apocalyptic number.

687887 is a deficient number, since it is larger than the sum of its proper divisors (13033).

687887 is a wasteful number, since it uses less digits than its factorization.

687887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13032.

The product of its digits is 150528, while the sum is 44.

The square root of 687887 is about 829.3895345373. The cubic root of 687887 is about 88.2752658199.

The spelling of 687887 in words is "six hundred eighty-seven thousand, eight hundred eighty-seven".