28288784173 has 4 divisors (see below), whose sum is σ = 30464844508. Its totient is φ = 26112723840.

The previous prime is 28288784129. The next prime is 28288784179. The reversal of 28288784173 is 37148788282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37148788282 = 2 ⋅18574394141.

It can be written as a sum of positive squares in 2 ways, for example, as 2310436489 + 25978347684 = 48067^2 + 161178^2 .

It is a cyclic number.

It is not a de Polignac number, because 28288784173 - 2²⁹ = 27751913261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28288784179) 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 3 ways as a sum of consecutive naturals, for example, 1088030148 + ... + 1088030173.

It is an arithmetic number, because the mean of its divisors is an integer number (7616211127).

Almost surely, 2^28288784173 is an apocalyptic number.

It is an amenable number.

28288784173 is a deficient number, since it is larger than the sum of its proper divisors (2176060335).

28288784173 is a wasteful number, since it uses less digits than its factorization.

28288784173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176060334.

The product of its digits is 9633792, while the sum is 58.

The spelling of 28288784173 in words is "twenty-eight billion, two hundred eighty-eight million, seven hundred eighty-four thousand, one hundred seventy-three".