8640615816 has 128 divisors (see below), whose sum is σ = 27464198400. Its totient is φ = 2465717760.

The previous prime is 8640615803. The next prime is 8640615821. The reversal of 8640615816 is 6185160468.

8640615816 is a `hidden beast` number, since 8 + 6 + 4 + 0 + 61 + 581 + 6 = 666.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1419756 + ... + 1425828.

It is an arithmetic number, because the mean of its divisors is an integer number (214564050).

Almost surely, 2^8640615816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8640615816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13732099200).

8640615816 is an abundant number, since it is smaller than the sum of its proper divisors (18823582584).

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

8640615816 is a wasteful number, since it uses less digits than its factorization.

8640615816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7036 (or 7026 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 8640615816 is about 92954.9128126104. The cubic root of 8640615816 is about 2052.0198862681.

The spelling of 8640615816 in words is "eight billion, six hundred forty million, six hundred fifteen thousand, eight hundred sixteen".