28321075305 has 48 divisors (see below), whose sum is σ = 51358769280. Its totient is φ = 14970832128.

The previous prime is 28321075247. The next prime is 28321075331. The reversal of 28321075305 is 50357012382.

It is a happy number.

28321075305 is a `hidden beast` number, since 28 + 321 + 0 + 7 + 5 + 305 = 666.

It is not a de Polignac number, because 28321075305 - 2⁸ = 28321075049 is a prime.

It is a super-3 number, since 3×28321075305³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28321075305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34156 + ... + 240434.

It is an arithmetic number, because the mean of its divisors is an integer number (1069974360).

Almost surely, 2^28321075305 is an apocalyptic number.

It is an amenable number.

28321075305 is a deficient number, since it is larger than the sum of its proper divisors (23037693975).

28321075305 is a wasteful number, since it uses less digits than its factorization.

28321075305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206412 (or 206400 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

Adding to 28321075305 its reverse (50357012382), we get a palindrome (78678087687).

The spelling of 28321075305 in words is "twenty-eight billion, three hundred twenty-one million, seventy-five thousand, three hundred five".