28540389717 has 24 divisors (see below), whose sum is σ = 49185254400. Its totient is φ = 16308793368.

The previous prime is 28540389677. The next prime is 28540389727. The reversal of 28540389717 is 71798304582.

It is a happy number.

28540389717 is a `hidden beast` number, since 2 + 8 + 540 + 3 + 8 + 97 + 1 + 7 = 666.

It is not a de Polignac number, because 28540389717 - 2¹⁸ = 28540127573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28540389727) 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 23 ways as a sum of consecutive naturals, for example, 10784917 + ... + 10787562.

It is an arithmetic number, because the mean of its divisors is an integer number (2049385600).

Almost surely, 2^28540389717 is an apocalyptic number.

28540389717 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28540389717 is a deficient number, since it is larger than the sum of its proper divisors (20644864683).

28540389717 is a wasteful number, since it uses less digits than its factorization.

28540389717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21572502 (or 21572489 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 28540389717 in words is "twenty-eight billion, five hundred forty million, three hundred eighty-nine thousand, seven hundred seventeen".