8621862512640 has 384 divisors, whose sum is σ = 30081133555200. Its totient is φ = 2095432335360.

The previous prime is 8621862512629. The next prime is 8621862512647. The reversal of 8621862512640 is 462152681268.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (384).

It is not an unprimeable number, because it can be changed into a prime (8621862512647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31412800 + ... + 31686080.

It is an arithmetic number, because the mean of its divisors is an integer number (78336285300).

Almost surely, 2^{8621862512640} is an apocalyptic number.

8621862512640 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 8621862512640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15040566777600).

8621862512640 is an abundant number, since it is smaller than the sum of its proper divisors (21459271042560).

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

8621862512640 is a wasteful number, since it uses less digits than its factorization.

8621862512640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273403 (or 273383 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 51.

The spelling of 8621862512640 in words is "eight trillion, six hundred twenty-one billion, eight hundred sixty-two million, five hundred twelve thousand, six hundred forty".