28171472565 has 16 divisors (see below), whose sum is σ = 47725789248. Its totient is φ = 14140974336.

The previous prime is 28171472521. The next prime is 28171472597. The reversal of 28171472565 is 56527417182.

It is not a de Polignac number, because 28171472565 - 2⁸ = 28171472309 is a prime.

It is a super-3 number, since 3×28171472565³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 55237927 + ... + 55238436.

It is an arithmetic number, because the mean of its divisors is an integer number (2982861828).

Almost surely, 2^28171472565 is an apocalyptic number.

It is an amenable number.

28171472565 is a deficient number, since it is larger than the sum of its proper divisors (19554316683).

28171472565 is a wasteful number, since it uses less digits than its factorization.

28171472565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110476388.

The product of its digits is 940800, while the sum is 48.

The spelling of 28171472565 in words is "twenty-eight billion, one hundred seventy-one million, four hundred seventy-two thousand, five hundred sixty-five".