28314531565 has 4 divisors (see below), whose sum is σ = 33977437884. Its totient is φ = 22651625248.

The previous prime is 28314531563. The next prime is 28314531569. The reversal of 28314531565 is 56513541382.

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 22407994249 + 5906537316 = 149693^2 + 76854^2 .

It is a cyclic number.

It is not a de Polignac number, because 28314531565 - 2¹ = 28314531563 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 (28314531563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2831453152 + ... + 2831453161.

It is an arithmetic number, because the mean of its divisors is an integer number (8494359471).

Almost surely, 2^28314531565 is an apocalyptic number.

It is an amenable number.

28314531565 is a deficient number, since it is larger than the sum of its proper divisors (5662906319).

28314531565 is an equidigital number, since it uses as much as digits as its factorization.

28314531565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5662906318.

The product of its digits is 432000, while the sum is 43.

The spelling of 28314531565 in words is "twenty-eight billion, three hundred fourteen million, five hundred thirty-one thousand, five hundred sixty-five".