28206944621 has 2 divisors, whose sum is σ = 28206944622. Its totient is φ = 28206944620.

The previous prime is 28206944533. The next prime is 28206944653. The reversal of 28206944621 is 12644960282.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27914055625 + 292888996 = 167075^2 + 17114^2 .

It is a cyclic number.

It is not a de Polignac number, because 28206944621 - 2¹⁴ = 28206928237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28206944321) 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, 14103472310 + 14103472311.

It is an arithmetic number, because the mean of its divisors is an integer number (14103472311).

Almost surely, 2^28206944621 is an apocalyptic number.

It is an amenable number.

28206944621 is a deficient number, since it is larger than the sum of its proper divisors (1).

28206944621 is an equidigital number, since it uses as much as digits as its factorization.

28206944621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 28206944621 in words is "twenty-eight billion, two hundred six million, nine hundred forty-four thousand, six hundred twenty-one".