289987065 has 48 divisors (see below), whose sum is σ = 514425600. Its totient is φ = 151070976.

The previous prime is 289987057. The next prime is 289987069. The reversal of 289987065 is 560789982.

It is a happy number.

It is not a de Polignac number, because 289987065 - 2³ = 289987057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (289987069) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 634317 + ... + 634773.

It is an arithmetic number, because the mean of its divisors is an integer number (10717200).

Almost surely, 2^289987065 is an apocalyptic number.

It is an amenable number.

289987065 is a deficient number, since it is larger than the sum of its proper divisors (224438535).

289987065 is a wasteful number, since it uses less digits than its factorization.

289987065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766 (or 763 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The square root of 289987065 is about 17029.0065770144. The cubic root of 289987065 is about 661.9007534913.

It can be divided in two parts, 28998 and 7065, that added together give a palindrome (36063).

The spelling of 289987065 in words is "two hundred eighty-nine million, nine hundred eighty-seven thousand, sixty-five".