8640500544 has 168 divisors, whose sum is σ = 27532657152. Its totient is φ = 2572784640.

The previous prime is 8640500543. The next prime is 8640500581. The reversal of 8640500544 is 4450050468.

8640500544 is a `hidden beast` number, since 8 + 64 + 0 + 50 + 0 + 544 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8640500499 and 8640500508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640500543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 213517 + ... + 250739.

It is an arithmetic number, because the mean of its divisors is an integer number (163884864).

Almost surely, 2^8640500544 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 8640500544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13766328576).

8640500544 is an abundant number, since it is smaller than the sum of its proper divisors (18892156608).

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

8640500544 is a wasteful number, since it uses less digits than its factorization.

8640500544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37285 (or 37272 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The square root of 8640500544 is about 92954.2927680051. The cubic root of 8640500544 is about 2052.0107610894.

The spelling of 8640500544 in words is "eight billion, six hundred forty million, five hundred thousand, five hundred forty-four".