8999644080 has 160 divisors (see below), whose sum is σ = 31918385664. Its totient is φ = 2054873088.

The previous prime is 8999644057. The next prime is 8999644081. The reversal of 8999644080 is 804469998.

It is a self number, because there is not a number n which added to its sum of digits gives 8999644080.

It is not an unprimeable number, because it can be changed into a prime (8999644081) 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, 1991904 + ... + 1996416.

Almost surely, 2^8999644080 is an apocalyptic number.

8999644080 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 8999644080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15959192832).

8999644080 is an abundant number, since it is smaller than the sum of its proper divisors (22918741584).

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

8999644080 is a wasteful number, since it uses less digits than its factorization.

8999644080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5723 (or 5717 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 57.

The square root of 8999644080 is about 94866.4539233970. The cubic root of 8999644080 is about 2080.0564025632.

The spelling of 8999644080 in words is "eight billion, nine hundred ninety-nine million, six hundred forty-four thousand, eighty".