689555328 has 128 divisors (see below), whose sum is σ = 2283690240. Its totient is φ = 179097600.

The previous prime is 689555287. The next prime is 689555333. The reversal of 689555328 is 823555986.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17908 + ... + 41228.

It is an arithmetic number, because the mean of its divisors is an integer number (17841330).

Almost surely, 2^689555328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689555328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1141845120).

689555328 is an abundant number, since it is smaller than the sum of its proper divisors (1594134912).

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

689555328 is a wasteful number, since it uses less digits than its factorization.

689555328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23356 (or 23344 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 51.

The square root of 689555328 is about 26259.3855221328. The cubic root of 689555328 is about 883.4657268590.

The spelling of 689555328 in words is "six hundred eighty-nine million, five hundred fifty-five thousand, three hundred twenty-eight".