8866621440 has 576 divisors, whose sum is σ = 33116428800. Its totient is φ = 2188640256.

The previous prime is 8866621433. The next prime is 8866621441. The reversal of 8866621440 is 441266688.

It is a tau number, because it is divible by the number of its divisors (576).

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

It is not an unprimeable number, because it can be changed into a prime (8866621441) 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, 99624916 + ... + 99625004.

It is an arithmetic number, because the mean of its divisors is an integer number (57493800).

Almost surely, 2^8866621440 is an apocalyptic number.

8866621440 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 8866621440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16558214400).

8866621440 is an abundant number, since it is smaller than the sum of its proper divisors (24249807360).

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

8866621440 is a wasteful number, since it uses less digits than its factorization.

8866621440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The square root of 8866621440 is about 94162.7391275339. The cubic root of 8866621440 is about 2069.7571373688.

The spelling of 8866621440 in words is "eight billion, eight hundred sixty-six million, six hundred twenty-one thousand, four hundred forty".