8561690880 has 144 divisors (see below), whose sum is σ = 28287161280. Its totient is φ = 2204360704.

The previous prime is 8561690771. The next prime is 8561690881. The reversal of 8561690880 is 880961658.

It is not an unprimeable number, because it can be changed into a prime (8561690881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72919 + ... + 149801.

It is an arithmetic number, because the mean of its divisors is an integer number (196438620).

Almost surely, 2^8561690880 is an apocalyptic number.

8561690880 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 8561690880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14143580640).

8561690880 is an abundant number, since it is smaller than the sum of its proper divisors (19725470400).

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

8561690880 is a wasteful number, since it uses less digits than its factorization.

8561690880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76936 (or 76922 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 51.

The square root of 8561690880 is about 92529.4054882014. The cubic root of 8561690880 is about 2045.7529268436.

The spelling of 8561690880 in words is "eight billion, five hundred sixty-one million, six hundred ninety thousand, eight hundred eighty".