8640289 has 16 divisors (see below), whose sum is σ = 10552320. Its totient is φ = 6914880.

The previous prime is 8640287. The next prime is 8640329. The reversal of 8640289 is 9820468.

It is not a de Polignac number, because 8640289 - 2¹ = 8640287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8640287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5607 + ... + 6979.

It is an arithmetic number, because the mean of its divisors is an integer number (659520).

Almost surely, 2^8640289 is an apocalyptic number.

It is an amenable number.

8640289 is a deficient number, since it is larger than the sum of its proper divisors (1912031).

8640289 is a wasteful number, since it uses less digits than its factorization.

8640289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 8640289 is about 2939.4368508270. The cubic root of 8640289 is about 205.1994014602.

The spelling of 8640289 in words is "eight million, six hundred forty thousand, two hundred eighty-nine".