28531173565764 has 81 divisors (see below), whose sum is σ = 72504462955197. Its totient is φ = 9460021239648.

The previous prime is 28531173565747. The next prime is 28531173565793. The reversal of 28531173565764 is 46756537113582.

The square root of 28531173565764 is 5341458.

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

28531173565764 is a `hidden beast` number, since 2 + 8 + 5 + 3 + 1 + 1 + 7 + 3 + 56 + 576 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 27954801072900 + 576372492864 = 5287230^2 + 759192^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6313601097 + ... + 6313605615.

Almost surely, 2^{28531173565764} is an apocalyptic number.

28531173565764 is the 5341458-th square number.

It is an amenable number.

28531173565764 is an abundant number, since it is smaller than the sum of its proper divisors (43973289389433).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28531173565764 is an frugal number, since it uses more digits than its factorization.

28531173565764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9442 (or 4721 counting only the distinct ones).

The product of its digits is 127008000, while the sum is 63.

The spelling of 28531173565764 in words is "twenty-eight trillion, five hundred thirty-one billion, one hundred seventy-three million, five hundred sixty-five thousand, seven hundred sixty-four".