8661171240 has 96 divisors (see below), whose sum is σ = 29191387680. Its totient is φ = 2309643072.

The previous prime is 8661171221. The next prime is 8661171287. The reversal of 8661171240 is 421711668.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8661171195 and 8661171204.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 435814 + ... + 455253.

It is an arithmetic number, because the mean of its divisors is an integer number (304076955).

Almost surely, 2^8661171240 is an apocalyptic number.

It is an amenable number.

8661171240 is an abundant number, since it is smaller than the sum of its proper divisors (20530216440).

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

8661171240 is a wasteful number, since it uses less digits than its factorization.

8661171240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891093 (or 891077 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 8661171240 is about 93065.4137690259. The cubic root of 8661171240 is about 2053.6458018270.

The spelling of 8661171240 in words is "eight billion, six hundred sixty-one million, one hundred seventy-one thousand, two hundred forty".