8211660 has 24 divisors (see below), whose sum is σ = 22992816. Its totient is φ = 2189760.

The previous prime is 8211659. The next prime is 8211673. The reversal of 8211660 is 661128.

It is a self number, because there is not a number n which added to its sum of digits gives 8211660.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68371 + ... + 68490.

It is an arithmetic number, because the mean of its divisors is an integer number (958034).

Almost surely, 2^8211660 is an apocalyptic number.

It is an amenable number.

8211660 is an abundant number, since it is smaller than the sum of its proper divisors (14781156).

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

8211660 is a wasteful number, since it uses less digits than its factorization.

8211660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136873 (or 136871 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 8211660 is about 2865.5994137353. The cubic root of 8211660 is about 201.7485024818.

Adding to 8211660 its reverse (661128), we get a palindrome (8872788).

The spelling of 8211660 in words is "eight million, two hundred eleven thousand, six hundred sixty".