687911 has 12 divisors (see below), whose sum is σ = 813960. Its totient is φ = 579600.

The previous prime is 687901. The next prime is 687917. The reversal of 687911 is 119786.

It is not a de Polignac number, because 687911 - 2⁶ = 687847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687917) 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 11 ways as a sum of consecutive naturals, for example, 4880 + ... + 5018.

It is an arithmetic number, because the mean of its divisors is an integer number (67830).

2⁶⁸⁷⁹¹¹ is an apocalyptic number.

687911 is a deficient number, since it is larger than the sum of its proper divisors (126049).

687911 is a wasteful number, since it uses less digits than its factorization.

687911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 247 counting only the distinct ones).

The product of its digits is 3024, while the sum is 32.

The square root of 687911 is about 829.4040028840. The cubic root of 687911 is about 88.2762924331.

The spelling of 687911 in words is "six hundred eighty-seven thousand, nine hundred eleven".