8644377904640 has 320 divisors, whose sum is σ = 22383879857856. Its totient is φ = 3189890875392.

The previous prime is 8644377904637. The next prime is 8644377904663. The reversal of 8644377904640 is 464097734468.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 517836134 + ... + 517852826.

Almost surely, 2^{8644377904640} is an apocalyptic number.

8644377904640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8644377904640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11191939928928).

8644377904640 is an abundant number, since it is smaller than the sum of its proper divisors (13739501953216).

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

8644377904640 is a wasteful number, since it uses less digits than its factorization.

8644377904640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16969 (or 16953 counting only the distinct ones).

The product of its (nonzero) digits is 97542144, while the sum is 62.

The spelling of 8644377904640 in words is "eight trillion, six hundred forty-four billion, three hundred seventy-seven million, nine hundred four thousand, six hundred forty".