28541614581 has 48 divisors (see below), whose sum is σ = 43092241920. Its totient is φ = 18188064000.

The previous prime is 28541614523. The next prime is 28541614583. The reversal of 28541614581 is 18541614582.

28541614581 is a `hidden beast` number, since 2 + 8 + 5 + 4 + 1 + 61 + 4 + 581 = 666.

It is not a de Polignac number, because 28541614581 - 2⁹ = 28541614069 is a prime.

It is a super-2 number, since 2×28541614581² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28541614583) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6097600 + ... + 6102278.

It is an arithmetic number, because the mean of its divisors is an integer number (897755040).

Almost surely, 2^28541614581 is an apocalyptic number.

It is an amenable number.

28541614581 is a deficient number, since it is larger than the sum of its proper divisors (14550627339).

28541614581 is a wasteful number, since it uses less digits than its factorization.

28541614581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5058 (or 5055 counting only the distinct ones).

The product of its digits is 307200, while the sum is 45.

Subtracting from 28541614581 its reverse (18541614582), we obtain a palindrome (9999999999).

The spelling of 28541614581 in words is "twenty-eight billion, five hundred forty-one million, six hundred fourteen thousand, five hundred eighty-one".