28083684666 has 16 divisors (see below), whose sum is σ = 56222828064. Its totient is φ = 9351985104.

The previous prime is 28083684659. The next prime is 28083684677. The reversal of 28083684666 is 66648638082.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2304196 + ... + 2316351.

It is an arithmetic number, because the mean of its divisors is an integer number (3513926754).

Almost surely, 2^28083684666 is an apocalyptic number.

28083684666 is an abundant number, since it is smaller than the sum of its proper divisors (28139143398).

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

28083684666 is a wasteful number, since it uses less digits than its factorization.

28083684666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4621565.

The product of its (nonzero) digits is 15925248, while the sum is 57.

The spelling of 28083684666 in words is "twenty-eight billion, eighty-three million, six hundred eighty-four thousand, six hundred sixty-six".