82188666 has 24 divisors (see below), whose sum is σ = 203515104. Its totient is φ = 23482440.

The previous prime is 82188647. The next prime is 82188679. The reversal of 82188666 is 66688128.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 326020 + ... + 326271.

It is an arithmetic number, because the mean of its divisors is an integer number (8479796).

Almost surely, 2^82188666 is an apocalyptic number.

82188666 is an abundant number, since it is smaller than the sum of its proper divisors (121326438).

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

82188666 is a wasteful number, since it uses less digits than its factorization.

82188666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652306 (or 652303 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 82188666 is about 9065.7964901050. The cubic root of 82188666 is about 434.7810868384.

The spelling of 82188666 in words is "eighty-two million, one hundred eighty-eight thousand, six hundred sixty-six".