688871 has 2 divisors, whose sum is σ = 688872. Its totient is φ = 688870.

The previous prime is 688867. The next prime is 688889. The reversal of 688871 is 178886.

688871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688871 - 2² = 688867 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344435 + 344436.

It is an arithmetic number, because the mean of its divisors is an integer number (344436).

2⁶⁸⁸⁸⁷¹ is an apocalyptic number.

688871 is a deficient number, since it is larger than the sum of its proper divisors (1).

688871 is an equidigital number, since it uses as much as digits as its factorization.

688871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 38.

The square root of 688871 is about 829.9825299366. The cubic root of 688871 is about 88.3173373986.

The spelling of 688871 in words is "six hundred eighty-eight thousand, eight hundred seventy-one".