689868 has 18 divisors (see below), whose sum is σ = 1743924. Its totient is φ = 229944.

The previous prime is 689867. The next prime is 689869. The reversal of 689868 is 868986.

It is an interprime number because it is at equal distance from previous prime (689867) and next prime (689869).

It is a tau number, because it is divible by the number of its divisors (18).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (689867) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9546 + ... + 9617.

2⁶⁸⁹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

689868 is an abundant number, since it is smaller than the sum of its proper divisors (1054056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689868 is a wasteful number, since it uses less digits than its factorization.

689868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19173 (or 19168 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 689868 is about 830.5829278284. The cubic root of 689868 is about 88.3599239594.

The spelling of 689868 in words is "six hundred eighty-nine thousand, eight hundred sixty-eight".