8661680 has 20 divisors (see below), whose sum is σ = 20138592. Its totient is φ = 3464640.

The previous prime is 8661673. The next prime is 8661683. The reversal of 8661680 is 861668.

8661680 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 8661680.

It is not an unprimeable number, because it can be changed into a prime (8661683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54056 + ... + 54215.

Almost surely, 2^8661680 is an apocalyptic number.

8661680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8661680 is an abundant number, since it is smaller than the sum of its proper divisors (11476912).

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

8661680 is a wasteful number, since it uses less digits than its factorization.

8661680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108284 (or 108278 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 8661680 is about 2943.0732236898. The cubic root of 8661680 is about 205.3686011646.

The spelling of 8661680 in words is "eight million, six hundred sixty-one thousand, six hundred eighty".