28644909915 has 16 divisors (see below), whose sum is σ = 45834486048. Its totient is φ = 15276408576.

The previous prime is 28644909913. The next prime is 28644909919. The reversal of 28644909915 is 51990944682.

It is not a de Polignac number, because 28644909915 - 2¹ = 28644909913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28644909911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282129 + ... + 369981.

It is an arithmetic number, because the mean of its divisors is an integer number (2864655378).

Almost surely, 2^28644909915 is an apocalyptic number.

28644909915 is a deficient number, since it is larger than the sum of its proper divisors (17189576133).

28644909915 is a wasteful number, since it uses less digits than its factorization.

28644909915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109598.

The product of its (nonzero) digits is 5598720, while the sum is 57.

The spelling of 28644909915 in words is "twenty-eight billion, six hundred forty-four million, nine hundred nine thousand, nine hundred fifteen".