28540617081 has 8 divisors (see below), whose sum is σ = 38054960160. Its totient is φ = 19026676032.

The previous prime is 28540617043. The next prime is 28540617089. The reversal of 28540617081 is 18071604582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28540617081 - 2¹⁸ = 28540354937 is a prime.

It is a super-2 number, since 2×28540617081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28540617089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166401 + ... + 291153.

It is an arithmetic number, because the mean of its divisors is an integer number (4756870020).

Almost surely, 2^28540617081 is an apocalyptic number.

It is an amenable number.

28540617081 is a deficient number, since it is larger than the sum of its proper divisors (9514343079).

28540617081 is a wasteful number, since it uses less digits than its factorization.

28540617081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201015.

The product of its (nonzero) digits is 107520, while the sum is 42.

The spelling of 28540617081 in words is "twenty-eight billion, five hundred forty million, six hundred seventeen thousand, eighty-one".