28081802566 has 16 divisors (see below), whose sum is σ = 42723309600. Its totient is φ = 13840767360.

The previous prime is 28081802513. The next prime is 28081802579. The reversal of 28081802566 is 66520818082.

It is a congruent 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, 1048510 + ... + 1074958.

It is an arithmetic number, because the mean of its divisors is an integer number (2670206850).

Almost surely, 2^28081802566 is an apocalyptic number.

28081802566 is a deficient number, since it is larger than the sum of its proper divisors (14641507034).

28081802566 is a wasteful number, since it uses less digits than its factorization.

28081802566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33999.

The product of its (nonzero) digits is 368640, while the sum is 46.

The spelling of 28081802566 in words is "twenty-eight billion, eighty-one million, eight hundred two thousand, five hundred sixty-six".