8981643520 has 144 divisors (see below), whose sum is σ = 23632237440. Its totient is φ = 3255386112.

The previous prime is 8981643493. The next prime is 8981643521. The reversal of 8981643520 is 253461898.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (8981643521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 551332 + ... + 567388.

It is an arithmetic number, because the mean of its divisors is an integer number (164112760).

Almost surely, 2^8981643520 is an apocalyptic number.

8981643520 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 8981643520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11816118720).

8981643520 is an abundant number, since it is smaller than the sum of its proper divisors (14650593920).

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

8981643520 is a wasteful number, since it uses less digits than its factorization.

8981643520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16120 (or 16106 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 8981643520 is about 94771.5332787225. The cubic root of 8981643520 is about 2078.6686746806.

The spelling of 8981643520 in words is "eight billion, nine hundred eighty-one million, six hundred forty-three thousand, five hundred twenty".