28804526021 has 2 divisors, whose sum is σ = 28804526022. Its totient is φ = 28804526020.

The previous prime is 28804526017. The next prime is 28804526081. The reversal of 28804526021 is 12062540882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16196380225 + 12608145796 = 127265^2 + 112286^2 .

It is a cyclic number.

It is not a de Polignac number, because 28804526021 - 2² = 28804526017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28804526081) 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, 14402263010 + 14402263011.

It is an arithmetic number, because the mean of its divisors is an integer number (14402263011).

Almost surely, 2^28804526021 is an apocalyptic number.

It is an amenable number.

28804526021 is a deficient number, since it is larger than the sum of its proper divisors (1).

28804526021 is an equidigital number, since it uses as much as digits as its factorization.

28804526021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61440, while the sum is 38.

The spelling of 28804526021 in words is "twenty-eight billion, eight hundred four million, five hundred twenty-six thousand, twenty-one".