28081831474 has 16 divisors (see below), whose sum is σ = 42216699096. Its totient is φ = 14009632000.

The previous prime is 28081831409. The next prime is 28081831483. The reversal of 28081831474 is 47413818082.

It can be written as a sum of positive squares in 4 ways, for example, as 21967686225 + 6114145249 = 148215^2 + 78193^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1900764 + ... + 1915480.

Almost surely, 2^28081831474 is an apocalyptic number.

28081831474 is a deficient number, since it is larger than the sum of its proper divisors (14134867622).

28081831474 is a wasteful number, since it uses less digits than its factorization.

28081831474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16781.

The product of its (nonzero) digits is 344064, while the sum is 46.

The spelling of 28081831474 in words is "twenty-eight billion, eighty-one million, eight hundred thirty-one thousand, four hundred seventy-four".