8644155648 has 72 divisors (see below), whose sum is σ = 24359394528. Its totient is φ = 2711887872.

The previous prime is 8644155647. The next prime is 8644155649. The reversal of 8644155648 is 8465514468.

It is an interprime number because it is at equal distance from previous prime (8644155647) and next prime (8644155649).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 8644155648.

It is not an unprimeable number, because it can be changed into a prime (8644155647) 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, 317986 + ... + 344097.

It is an arithmetic number, because the mean of its divisors is an integer number (338324924).

Almost surely, 2^8644155648 is an apocalyptic number.

It is an amenable number.

8644155648 is an abundant number, since it is smaller than the sum of its proper divisors (15715238880).

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

8644155648 is a wasteful number, since it uses less digits than its factorization.

8644155648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662119 (or 662105 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 51.

The square root of 8644155648 is about 92973.9514487795. The cubic root of 8644155648 is about 2052.3000674538.

The spelling of 8644155648 in words is "eight billion, six hundred forty-four million, one hundred fifty-five thousand, six hundred forty-eight".