8640816 has 40 divisors (see below), whose sum is σ = 23046144. Its totient is φ = 2786880.

The previous prime is 8640799. The next prime is 8640817. The reversal of 8640816 is 6180468.

It is a super-2 number, since 2×8640816² = 149327402291712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8640817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1416 + ... + 4391.

Almost surely, 2^8640816 is an apocalyptic number.

It is an amenable number.

8640816 is an abundant number, since it is smaller than the sum of its proper divisors (14405328).

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

8640816 is a wasteful number, since it uses less digits than its factorization.

8640816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5849 (or 5843 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 8640816 is about 2939.5264924814. The cubic root of 8640816 is about 205.2035733070.

The spelling of 8640816 in words is "eight million, six hundred forty thousand, eight hundred sixteen".