8640217 has 8 divisors (see below), whose sum is σ = 8961120. Its totient is φ = 8324640.

The previous prime is 8640211. The next prime is 8640221. The reversal of 8640217 is 7120468.

8640217 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8640217 - 2¹⁵ = 8607449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8640211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2134 + ... + 4672.

It is an arithmetic number, because the mean of its divisors is an integer number (1120140).

Almost surely, 2^8640217 is an apocalyptic number.

It is an amenable number.

8640217 is a deficient number, since it is larger than the sum of its proper divisors (320903).

8640217 is a wasteful number, since it uses less digits than its factorization.

8640217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2663.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 8640217 is about 2939.4246035576. The cubic root of 8640217 is about 205.1988314793.

The spelling of 8640217 in words is "eight million, six hundred forty thousand, two hundred seventeen".