8640622648 has 64 divisors (see below), whose sum is σ = 19060090560. Its totient is φ = 3595677696.

The previous prime is 8640622643. The next prime is 8640622649. The reversal of 8640622648 is 8462260468.

It is a junction number, because it is equal to n+sod(n) for n = 8640622598 and 8640622607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640622643) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 272890 + ... + 302902.

It is an arithmetic number, because the mean of its divisors is an integer number (297813915).

Almost surely, 2^8640622648 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 8640622648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9530045280).

8640622648 is an abundant number, since it is smaller than the sum of its proper divisors (10419467912).

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

8640622648 is a wasteful number, since it uses less digits than its factorization.

8640622648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30176 (or 30172 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 46.

The square root of 8640622648 is about 92954.9495616022. The cubic root of 8640622648 is about 2052.0204271013.

The spelling of 8640622648 in words is "eight billion, six hundred forty million, six hundred twenty-two thousand, six hundred forty-eight".