28866009999 has 32 divisors (see below), whose sum is σ = 41102691840. Its totient is φ = 17980886528.

The previous prime is 28866009971. The next prime is 28866010027. The reversal of 28866009999 is 99990066882.

It is a Cunningham number, because it is equal to 169900²-1.

It is an interprime number because it is at equal distance from previous prime (28866009971) and next prime (28866010027).

It is a cyclic number.

It is not a de Polignac number, because 28866009999 - 2⁷ = 28866009871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28866009899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 481387 + ... + 538019.

It is an arithmetic number, because the mean of its divisors is an integer number (1284459120).

Almost surely, 2^28866009999 is an apocalyptic number.

28866009999 is a deficient number, since it is larger than the sum of its proper divisors (12236681841).

28866009999 is a wasteful number, since it uses less digits than its factorization.

28866009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56831.

The product of its (nonzero) digits is 30233088, while the sum is 66.

The spelling of 28866009999 in words is "twenty-eight billion, eight hundred sixty-six million, nine thousand, nine hundred ninety-nine".