28502513521 has 2 divisors, whose sum is σ = 28502513522. Its totient is φ = 28502513520.

The previous prime is 28502513503. The next prime is 28502513587. The reversal of 28502513521 is 12531520582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22721040225 + 5781473296 = 150735^2 + 76036^2 .

It is a cyclic number.

It is not a de Polignac number, because 28502513521 - 2¹³ = 28502505329 is a prime.

It is not a weakly prime, because it can be changed into another prime (28502513591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14251256760 + 14251256761.

It is an arithmetic number, because the mean of its divisors is an integer number (14251256761).

Almost surely, 2^28502513521 is an apocalyptic number.

It is an amenable number.

28502513521 is a deficient number, since it is larger than the sum of its proper divisors (1).

28502513521 is an equidigital number, since it uses as much as digits as its factorization.

28502513521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24000, while the sum is 34.

The spelling of 28502513521 in words is "twenty-eight billion, five hundred two million, five hundred thirteen thousand, five hundred twenty-one".