28539265081 has 8 divisors (see below), whose sum is σ = 29815691400. Its totient is φ = 27282326400.

The previous prime is 28539265057. The next prime is 28539265087. The reversal of 28539265081 is 18056293582.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7935246400 + 20604018681 = 89080^2 + 143541^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28539265081 - 2¹⁵ = 28539232313 is a prime.

It is a super-2 number, since 2×28539265081² (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 (28539265087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4868916 + ... + 4874773.

It is an arithmetic number, because the mean of its divisors is an integer number (3726961425).

Almost surely, 2^28539265081 is an apocalyptic number.

It is an amenable number.

28539265081 is a deficient number, since it is larger than the sum of its proper divisors (1276426319).

28539265081 is a wasteful number, since it uses less digits than its factorization.

28539265081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9743819.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 28539265081 in words is "twenty-eight billion, five hundred thirty-nine million, two hundred sixty-five thousand, eighty-one".