28169278241 has 8 divisors (see below), whose sum is σ = 30372751080. Its totient is φ = 25971034752.

The previous prime is 28169278237. The next prime is 28169278289. The reversal of 28169278241 is 14287296182.

It can be written as a sum of positive squares in 4 ways, for example, as 47665216 + 28121613025 = 6904^2 + 167695^2 .

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

It is not a de Polignac number, because 28169278241 - 2² = 28169278237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28169278241.

It is not an unprimeable number, because it can be changed into a prime (28169278201) 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, 1296140 + ... + 1317693.

It is an arithmetic number, because the mean of its divisors is an integer number (3796593885).

Almost surely, 2^28169278241 is an apocalyptic number.

It is an amenable number.

28169278241 is a deficient number, since it is larger than the sum of its proper divisors (2203472839).

28169278241 is a wasteful number, since it uses less digits than its factorization.

28169278241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614675.

The product of its digits is 774144, while the sum is 50.

The spelling of 28169278241 in words is "twenty-eight billion, one hundred sixty-nine million, two hundred seventy-eight thousand, two hundred forty-one".