8664660 has 72 divisors (see below), whose sum is σ = 27013896. Its totient is φ = 2246400.

The previous prime is 8664613. The next prime is 8664661. The reversal of 8664660 is 664668.

8664660 is a `hidden beast` number, since 8 + 6 + 646 + 6 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 266256 + 8398404 = 516^2 + 2898^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8664661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6010 + ... + 7310.

It is an arithmetic number, because the mean of its divisors is an integer number (375193).

Almost surely, 2^8664660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8664660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13506948).

8664660 is an abundant number, since it is smaller than the sum of its proper divisors (18349236).

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

8664660 is a wasteful number, since it uses less digits than its factorization.

8664660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353 (or 1348 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 8664660 is about 2943.5794536584. The cubic root of 8664660 is about 205.3921504168.

It can be divided in two parts, 86 and 64660, that added together give a palindrome (64746).

The spelling of 8664660 in words is "eight million, six hundred sixty-four thousand, six hundred sixty".