28844721987 has 32 divisors (see below), whose sum is σ = 39633960960. Its totient is φ = 18652786080.

The previous prime is 28844721973. The next prime is 28844721989. The reversal of 28844721987 is 78912744882.

It is not a de Polignac number, because 28844721987 - 2¹⁰ = 28844720963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28844721987.

It is not an unprimeable number, because it can be changed into a prime (28844721989) 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, 4978062 + ... + 4983852.

It is an arithmetic number, because the mean of its divisors is an integer number (1238561280).

Almost surely, 2^28844721987 is an apocalyptic number.

28844721987 is a deficient number, since it is larger than the sum of its proper divisors (10789238973).

28844721987 is a wasteful number, since it uses less digits than its factorization.

28844721987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6223.

The product of its digits is 14450688, while the sum is 60.

The spelling of 28844721987 in words is "twenty-eight billion, eight hundred forty-four million, seven hundred twenty-one thousand, nine hundred eighty-seven".