8581997120 has 56 divisors (see below), whose sum is σ = 21638004984. Its totient is φ = 3230867456.

The previous prime is 8581997119. The next prime is 8581997131. The reversal of 8581997120 is 217991858.

It can be written as a sum of positive squares in 4 ways, for example, as 2115264064 + 6466733056 = 45992^2 + 80416^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 783347 + ... + 794226.

Almost surely, 2^8581997120 is an apocalyptic number.

8581997120 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8581997120 is an abundant number, since it is smaller than the sum of its proper divisors (13056007864).

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

8581997120 is a wasteful number, since it uses less digits than its factorization.

8581997120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577607 (or 1577597 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 50.

The square root of 8581997120 is about 92639.0690799514. The cubic root of 8581997120 is about 2047.3689920019.

The spelling of 8581997120 in words is "eight billion, five hundred eighty-one million, nine hundred ninety-seven thousand, one hundred twenty".