8644521375 has 48 divisors (see below), whose sum is σ = 17809376832. Its totient is φ = 3951777600.

The previous prime is 8644521311. The next prime is 8644521377. The reversal of 8644521375 is 5731254468.

8644521375 is a `hidden beast` number, since 8 + 64 + 452 + 137 + 5 = 666.

It is not a de Polignac number, because 8644521375 - 2⁶ = 8644521311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 8644521375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8644521377) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 540984 + ... + 556733.

It is an arithmetic number, because the mean of its divisors is an integer number (371028684).

Almost surely, 2^8644521375 is an apocalyptic number.

8644521375 is an abundant number, since it is smaller than the sum of its proper divisors (9164855457).

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

8644521375 is a wasteful number, since it uses less digits than its factorization.

8644521375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097745 (or 1097732 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 8644521375 is about 92975.9182530616. The cubic root of 8644521375 is about 2052.3290107457.

The spelling of 8644521375 in words is "eight billion, six hundred forty-four million, five hundred twenty-one thousand, three hundred seventy-five".