28135040191 has 32 divisors (see below), whose sum is σ = 31543948800. Its totient is φ = 24971379840.

The previous prime is 28135040173. The next prime is 28135040201. The reversal of 28135040191 is 19104053182.

It is a cyclic number.

It is not a de Polignac number, because 28135040191 - 2⁵ = 28135040159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28135040161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5296845 + ... + 5302153.

It is an arithmetic number, because the mean of its divisors is an integer number (985748400).

Almost surely, 2^28135040191 is an apocalyptic number.

28135040191 is a deficient number, since it is larger than the sum of its proper divisors (3408908609).

28135040191 is a wasteful number, since it uses less digits than its factorization.

28135040191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5599.

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 28135040191 in words is "twenty-eight billion, one hundred thirty-five million, forty thousand, one hundred ninety-one".