8661540 has 48 divisors (see below), whose sum is σ = 24393600. Its totient is φ = 2296320.

The previous prime is 8661529. The next prime is 8661553. The reversal of 8661540 is 451668.

8661540 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 8661498 and 8661507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14161 + ... + 14759.

It is an arithmetic number, because the mean of its divisors is an integer number (508200).

Almost surely, 2^8661540 is an apocalyptic number.

It is an amenable number.

8661540 is an abundant number, since it is smaller than the sum of its proper divisors (15732060).

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

8661540 is a wasteful number, since it uses less digits than its factorization.

8661540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852 (or 850 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 8661540 is about 2943.0494389323. The cubic root of 8661540 is about 205.3674946911.

The spelling of 8661540 in words is "eight million, six hundred sixty-one thousand, five hundred forty".