689028 has 24 divisors (see below), whose sum is σ = 1633632. Its totient is φ = 225984.

The previous prime is 689021. The next prime is 689033. The reversal of 689028 is 820986.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 689028.

It is not an unprimeable number, because it can be changed into a prime (689021) by changing a digit.

689028 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376 + ... + 1232.

It is an arithmetic number, because the mean of its divisors is an integer number (68068).

2⁶⁸⁹⁰²⁸ is an apocalyptic number.

It is an amenable number.

689028 is an abundant number, since it is smaller than the sum of its proper divisors (944604).

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

689028 is a wasteful number, since it uses less digits than its factorization.

689028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931 (or 929 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 689028 is about 830.0771048523. The cubic root of 689028 is about 88.3240463319.

The spelling of 689028 in words is "six hundred eighty-nine thousand, twenty-eight".