28135040205 has 32 divisors (see below), whose sum is σ = 47788683264. Its totient is φ = 14085764096.

The previous prime is 28135040203. The next prime is 28135040281. The reversal of 28135040205 is 50204053182.

It is a cyclic number.

It is not a de Polignac number, because 28135040205 - 2¹ = 28135040203 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28135040201) 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, 46374 + ... + 241703.

It is an arithmetic number, because the mean of its divisors is an integer number (1493396352).

Almost surely, 2^28135040205 is an apocalyptic number.

It is an amenable number.

28135040205 is a deficient number, since it is larger than the sum of its proper divisors (19653643059).

28135040205 is a wasteful number, since it uses less digits than its factorization.

28135040205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288485.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 28135040205 its reverse (50204053182), we get a palindrome (78339093387).

The spelling of 28135040205 in words is "twenty-eight billion, one hundred thirty-five million, forty thousand, two hundred five".