28531319525 has 12 divisors (see below), whose sum is σ = 35703416100. Its totient is φ = 22615649280.

The previous prime is 28531319513. The next prime is 28531319527. The reversal of 28531319525 is 52591313582.

It can be written as a sum of positive squares in 6 ways, for example, as 1708086241 + 26823233284 = 41329^2 + 163778^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28531319525 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28531319527) 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 11 ways as a sum of consecutive naturals, for example, 5232380 + ... + 5237829.

It is an arithmetic number, because the mean of its divisors is an integer number (2975284675).

Almost surely, 2^28531319525 is an apocalyptic number.

28531319525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28531319525 is a deficient number, since it is larger than the sum of its proper divisors (7172096575).

28531319525 is a wasteful number, since it uses less digits than its factorization.

28531319525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10470328 (or 10470323 counting only the distinct ones).

The product of its digits is 324000, while the sum is 44.

The spelling of 28531319525 in words is "twenty-eight billion, five hundred thirty-one million, three hundred nineteen thousand, five hundred twenty-five".