28131236105 has 32 divisors (see below), whose sum is σ = 39246535680. Its totient is φ = 18957265920.

The previous prime is 28131236101. The next prime is 28131236113. The reversal of 28131236105 is 50163213182.

It is not a de Polignac number, because 28131236105 - 2² = 28131236101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28131236101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2764016 + ... + 2774174.

It is an arithmetic number, because the mean of its divisors is an integer number (1226454240).

Almost surely, 2^28131236105 is an apocalyptic number.

It is an amenable number.

28131236105 is a deficient number, since it is larger than the sum of its proper divisors (11115299575).

28131236105 is a wasteful number, since it uses less digits than its factorization.

28131236105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11529.

The product of its (nonzero) digits is 8640, while the sum is 32.

Adding to 28131236105 its reverse (50163213182), we get a palindrome (78294449287).

The spelling of 28131236105 in words is "twenty-eight billion, one hundred thirty-one million, two hundred thirty-six thousand, one hundred five".