28541504881 has 16 divisors (see below), whose sum is σ = 28877328144. Its totient is φ = 28208253184.

The previous prime is 28541504879. The next prime is 28541504923. The reversal of 28541504881 is 18840514582.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 932691600 + 27608813281 = 30540^2 + 166159^2 .

It is a cyclic number.

It is not a de Polignac number, because 28541504881 - 2¹ = 28541504879 is a prime.

It is a super-2 number, since 2×28541504881² (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 (28541504581) 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, 35810775 + ... + 35811571.

It is an arithmetic number, because the mean of its divisors is an integer number (1804833009).

Almost surely, 2^28541504881 is an apocalyptic number.

28541504881 is the 106849-th centered pentagonal number.

It is an amenable number.

28541504881 is a deficient number, since it is larger than the sum of its proper divisors (335823263).

28541504881 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (28541504880) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1940).

28541504881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940.

The product of its (nonzero) digits is 409600, while the sum is 46.

The spelling of 28541504881 in words is "twenty-eight billion, five hundred forty-one million, five hundred four thousand, eight hundred eighty-one".