689289128 has 32 divisors (see below), whose sum is σ = 1414035360. Its totient is φ = 312396480.

The previous prime is 689289127. The next prime is 689289131. The reversal of 689289128 is 821982986.

689289128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 689289128.

It is not an unprimeable number, because it can be changed into a prime (689289127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19250 + ... + 41822.

It is an arithmetic number, because the mean of its divisors is an integer number (44188605).

Almost surely, 2^689289128 is an apocalyptic number.

It is an amenable number.

689289128 is an abundant number, since it is smaller than the sum of its proper divisors (724746232).

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

689289128 is a wasteful number, since it uses less digits than its factorization.

689289128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22937 (or 22933 counting only the distinct ones).

The product of its digits is 995328, while the sum is 53.

The square root of 689289128 is about 26254.3163689326. The cubic root of 689289128 is about 883.3520261224.

The spelling of 689289128 in words is "six hundred eighty-nine million, two hundred eighty-nine thousand, one hundred twenty-eight".