28881836521 has 16 divisors (see below), whose sum is σ = 30650256000. Its totient is φ = 27138786048.

The previous prime is 28881836509. The next prime is 28881836561. The reversal of 28881836521 is 12563818882.

It is a cyclic number.

It is not a de Polignac number, because 28881836521 - 2⁷ = 28881836393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28881836561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2051121 + ... + 2065153.

It is an arithmetic number, because the mean of its divisors is an integer number (1915641000).

Almost surely, 2^28881836521 is an apocalyptic number.

It is an amenable number.

28881836521 is a deficient number, since it is larger than the sum of its proper divisors (1768419479).

28881836521 is a wasteful number, since it uses less digits than its factorization.

28881836521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14928.

The product of its digits is 1474560, while the sum is 52.

The spelling of 28881836521 in words is "twenty-eight billion, eight hundred eighty-one million, eight hundred thirty-six thousand, five hundred twenty-one".