689768 has 16 divisors (see below), whose sum is σ = 1304160. Its totient is φ = 342000.

The previous prime is 689761. The next prime is 689771. The reversal of 689768 is 867986.

It is not an unprimeable number, because it can be changed into a prime (689761) by changing a digit.

689768 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 923 + ... + 1493.

It is an arithmetic number, because the mean of its divisors is an integer number (81510).

2⁶⁸⁹⁷⁶⁸ is an apocalyptic number.

It is an amenable number.

689768 is a deficient number, since it is larger than the sum of its proper divisors (614392).

689768 is a wasteful number, since it uses less digits than its factorization.

689768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728 (or 724 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 689768 is about 830.5227269618. The cubic root of 689768 is about 88.3556543410.

It can be divided in two parts, 6897 and 68, that multiplied together give a triangular number (468996 = T₉₆₈).

The spelling of 689768 in words is "six hundred eighty-nine thousand, seven hundred sixty-eight".