8643816728 has 8 divisors (see below), whose sum is σ = 16207156380. Its totient is φ = 4321908360.

The previous prime is 8643816721. The next prime is 8643816743. The reversal of 8643816728 is 8276183468.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 8643816728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8643816721) 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 as a sum of consecutive naturals, namely, 540238538 + ... + 540238553.

Almost surely, 2^8643816728 is an apocalyptic number.

It is an amenable number.

8643816728 is a deficient number, since it is larger than the sum of its proper divisors (7563339652).

8643816728 is a wasteful number, since it uses less digits than its factorization.

8643816728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080477097 (or 1080477093 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 53.

The square root of 8643816728 is about 92972.1287698631. The cubic root of 8643816728 is about 2052.2732449139.

The spelling of 8643816728 in words is "eight billion, six hundred forty-three million, eight hundred sixteen thousand, seven hundred twenty-eight".