28173147381 has 8 divisors (see below), whose sum is σ = 41737996160. Its totient is φ = 18782098236.

The previous prime is 28173147367. The next prime is 28173147383. The reversal of 28173147381 is 18374137182.

28173147381 is a `hidden beast` number, since 2 + 8 + 173 + 1 + 473 + 8 + 1 = 666.

It is not a de Polignac number, because 28173147381 - 2¹⁰ = 28173146357 is a prime.

It is a super-2 number, since 2×28173147381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28173147383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521724925 + ... + 521724978.

It is an arithmetic number, because the mean of its divisors is an integer number (5217249520).

Almost surely, 2^28173147381 is an apocalyptic number.

It is an amenable number.

28173147381 is a deficient number, since it is larger than the sum of its proper divisors (13564848779).

28173147381 is a wasteful number, since it uses less digits than its factorization.

28173147381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043449912 (or 1043449906 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The spelling of 28173147381 in words is "twenty-eight billion, one hundred seventy-three million, one hundred forty-seven thousand, three hundred eighty-one".