28330332521 has 2 divisors, whose sum is σ = 28330332522. Its totient is φ = 28330332520.

The previous prime is 28330332487. The next prime is 28330332557. The reversal of 28330332521 is 12523303382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28276104025 + 54228496 = 168155^2 + 7364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28330332521 is a prime.

It is not a weakly prime, because it can be changed into another prime (28330332571) 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 as a sum of consecutive naturals, namely, 14165166260 + 14165166261.

It is an arithmetic number, because the mean of its divisors is an integer number (14165166261).

Almost surely, 2^28330332521 is an apocalyptic number.

It is an amenable number.

28330332521 is a deficient number, since it is larger than the sum of its proper divisors (1).

28330332521 is an equidigital number, since it uses as much as digits as its factorization.

28330332521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 32.

The spelling of 28330332521 in words is "twenty-eight billion, three hundred thirty million, three hundred thirty-two thousand, five hundred twenty-one".