689955128 has 8 divisors (see below), whose sum is σ = 1293665880. Its totient is φ = 344977560.

The previous prime is 689955109. The next prime is 689955131. The reversal of 689955128 is 821559986.

689955128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 689955128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43122188 + ... + 43122203.

It is an arithmetic number, because the mean of its divisors is an integer number (161708235).

Almost surely, 2^689955128 is an apocalyptic number.

It is an amenable number.

689955128 is a deficient number, since it is larger than the sum of its proper divisors (603710752).

689955128 is a wasteful number, since it uses less digits than its factorization.

689955128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86244397 (or 86244393 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 53.

The square root of 689955128 is about 26266.9969353179. The cubic root of 689955128 is about 883.6364365624.

The spelling of 689955128 in words is "six hundred eighty-nine million, nine hundred fifty-five thousand, one hundred twenty-eight".