28595621 has 2 divisors, whose sum is σ = 28595622. Its totient is φ = 28595620.

The previous prime is 28595603. The next prime is 28595639. The reversal of 28595621 is 12659582.

It is a balanced prime because it is at equal distance from previous prime (28595603) and next prime (28595639).

It can be written as a sum of positive squares in only one way, i.e., 25391521 + 3204100 = 5039^2 + 1790^2 .

It is a cyclic number.

It is not a de Polignac number, because 28595621 - 2¹⁰ = 28594597 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (28595681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14297810 + 14297811.

It is an arithmetic number, because the mean of its divisors is an integer number (14297811).

Almost surely, 2^28595621 is an apocalyptic number.

It is an amenable number.

28595621 is a deficient number, since it is larger than the sum of its proper divisors (1).

28595621 is an equidigital number, since it uses as much as digits as its factorization.

28595621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 38.

The square root of 28595621 is about 5347.4873538887. The cubic root of 28595621 is about 305.7969697097.

The spelling of 28595621 in words is "twenty-eight million, five hundred ninety-five thousand, six hundred twenty-one".