28743017173 has 4 divisors (see below), whose sum is σ = 30954018508. Its totient is φ = 26532015840.

The previous prime is 28743017123. The next prime is 28743017207. The reversal of 28743017173 is 37171034782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14471608804 + 14271408369 = 120298^2 + 119463^2 .

It is a cyclic number.

It is not a de Polignac number, because 28743017173 - 2²⁵ = 28709462741 is a prime.

It is a super-2 number, since 2×28743017173² (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 (28743017123) 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 3 ways as a sum of consecutive naturals, for example, 1105500648 + ... + 1105500673.

It is an arithmetic number, because the mean of its divisors is an integer number (7738504627).

Almost surely, 2^28743017173 is an apocalyptic number.

It is an amenable number.

28743017173 is a deficient number, since it is larger than the sum of its proper divisors (2211001335).

28743017173 is a wasteful number, since it uses less digits than its factorization.

28743017173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211001334.

The product of its (nonzero) digits is 197568, while the sum is 43.

The spelling of 28743017173 in words is "twenty-eight billion, seven hundred forty-three million, seventeen thousand, one hundred seventy-three".