28163888041 has 9 divisors (see below), whose sum is σ = 28317266341. Its totient is φ = 28011338752.

The previous prime is 28163888029. The next prime is 28163888069. The reversal of 28163888041 is 14088836182.

The square root of 28163888041 is 167821.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 3846604441 + 24317283600 = 62021^2 + 155940^2 .

It is not a de Polignac number, because 28163888041 - 2¹¹ = 28163885993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28163888341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 43129671 + ... + 43130323.

Almost surely, 2^28163888041 is an apocalyptic number.

28163888041 is the 167821-st square number.

28163888041 is the 83911-st centered octagonal number.

It is an amenable number.

28163888041 is a deficient number, since it is larger than the sum of its proper divisors (153378300).

28163888041 is an frugal number, since it uses more digits than its factorization.

28163888041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 49.

Multiplying 28163888041 by its sum of digits (49), we get a square (1380030514009 = 1174747²).

The spelling of 28163888041 in words is "twenty-eight billion, one hundred sixty-three million, eight hundred eighty-eight thousand, forty-one".