8640328 has 16 divisors (see below), whose sum is σ = 16272000. Its totient is φ = 4301136.

The previous prime is 8640287. The next prime is 8640329. The reversal of 8640328 is 8230468.

It is a happy number.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 8640328.

It is not an unprimeable number, because it can be changed into a prime (8640329) 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 3 ways as a sum of consecutive naturals, for example, 348 + ... + 4171.

It is an arithmetic number, because the mean of its divisors is an integer number (1017000).

Almost surely, 2^8640328 is an apocalyptic number.

It is an amenable number.

8640328 is a deficient number, since it is larger than the sum of its proper divisors (7631672).

8640328 is a wasteful number, since it uses less digits than its factorization.

8640328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4764 (or 4760 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 8640328 is about 2939.4434847433. The cubic root of 8640328 is about 205.1997101985.

The spelling of 8640328 in words is "eight million, six hundred forty thousand, three hundred twenty-eight".