28102621 has 2 divisors, whose sum is σ = 28102622. Its totient is φ = 28102620.

The previous prime is 28102609. The next prime is 28102637. The reversal of 28102621 is 12620182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27931225 + 171396 = 5285^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 28102621 - 2¹¹ = 28100573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28102592 and 28102601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28102601) 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, 14051310 + 14051311.

It is an arithmetic number, because the mean of its divisors is an integer number (14051311).

Almost surely, 2^28102621 is an apocalyptic number.

It is an amenable number.

28102621 is a deficient number, since it is larger than the sum of its proper divisors (1).

28102621 is an equidigital number, since it uses as much as digits as its factorization.

28102621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 28102621 is about 5301.1905266647. The cubic root of 28102621 is about 304.0294184654.

The spelling of 28102621 in words is "twenty-eight million, one hundred two thousand, six hundred twenty-one".