8666660 has 24 divisors (see below), whose sum is σ = 19158720. Its totient is φ = 3284064.

The previous prime is 8666627. The next prime is 8666681. The reversal of 8666660 is 666668.

8666660 = 207² + 208² + ... + 326².

8666660 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×8666660² = 150221991111200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11024 + ... + 11783.

It is an arithmetic number, because the mean of its divisors is an integer number (798280).

Almost surely, 2^8666660 is an apocalyptic number.

It is an amenable number.

8666660 is an abundant number, since it is smaller than the sum of its proper divisors (10492060).

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

8666660 is a wasteful number, since it uses less digits than its factorization.

8666660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22835 (or 22833 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 8666660 is about 2943.9191564987. The cubic root of 8666660 is about 205.4079522562.

The spelling of 8666660 in words is "eight million, six hundred sixty-six thousand, six hundred sixty".