8581991520 has 192 divisors, whose sum is σ = 27525173760. Its totient is φ = 2247168000.

The previous prime is 8581991501. The next prime is 8581991521. The reversal of 8581991520 is 251991858.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 8581991520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8581991521) 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, 14279220 + ... + 14279820.

It is an arithmetic number, because the mean of its divisors is an integer number (143360280).

Almost surely, 2^8581991520 is an apocalyptic number.

8581991520 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 8581991520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13762586880).

8581991520 is an abundant number, since it is smaller than the sum of its proper divisors (18943182240).

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

8581991520 is a wasteful number, since it uses less digits than its factorization.

8581991520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109 (or 1101 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 48.

The square root of 8581991520 is about 92639.0388551177. The cubic root of 8581991520 is about 2047.3685466794.

The spelling of 8581991520 in words is "eight billion, five hundred eighty-one million, nine hundred ninety-one thousand, five hundred twenty".