28510271681 has 16 divisors (see below), whose sum is σ = 29114553600. Its totient is φ = 27911656080.

The previous prime is 28510271633. The next prime is 28510271689. The reversal of 28510271681 is 18617201582.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28510271681 is a prime.

It is a super-2 number, since 2×28510271681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28510271689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16779770 + ... + 16781468.

It is an arithmetic number, because the mean of its divisors is an integer number (1819659600).

Almost surely, 2^28510271681 is an apocalyptic number.

It is an amenable number.

28510271681 is a deficient number, since it is larger than the sum of its proper divisors (604281919).

28510271681 is a wasteful number, since it uses less digits than its factorization.

28510271681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3164.

The product of its (nonzero) digits is 53760, while the sum is 41.

The spelling of 28510271681 in words is "twenty-eight billion, five hundred ten million, two hundred seventy-one thousand, six hundred eighty-one".