688867 has 2 divisors, whose sum is σ = 688868. Its totient is φ = 688866.

The previous prime is 688861. The next prime is 688871. The reversal of 688867 is 768886.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688867 is a prime.

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, 344433 + 344434.

It is an arithmetic number, because the mean of its divisors is an integer number (344434).

2⁶⁸⁸⁸⁶⁷ is an apocalyptic number.

688867 is a deficient number, since it is larger than the sum of its proper divisors (1).

688867 is an equidigital number, since it uses as much as digits as its factorization.

688867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 43.

The square root of 688867 is about 829.9801202439. The cubic root of 688867 is about 88.3171664571.

The spelling of 688867 in words is "six hundred eighty-eight thousand, eight hundred sixty-seven".