289145168 has 20 divisors (see below), whose sum is σ = 603312948. Its totient is φ = 133451520.

The previous prime is 289145149. The next prime is 289145179. The reversal of 289145168 is 861541982.

It can be written as a sum of positive squares in 2 ways, for example, as 149621824 + 139523344 = 12232^2 + 11812^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694853 + ... + 695268.

Almost surely, 2^289145168 is an apocalyptic number.

It is an amenable number.

289145168 is an abundant number, since it is smaller than the sum of its proper divisors (314167780).

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

289145168 is a wasteful number, since it uses less digits than its factorization.

289145168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390142 (or 1390136 counting only the distinct ones).

The product of its digits is 138240, while the sum is 44.

The square root of 289145168 is about 17004.2691110203. The cubic root of 289145168 is about 661.2595841965.

The spelling of 289145168 in words is "two hundred eighty-nine million, one hundred forty-five thousand, one hundred sixty-eight".