28211480309 has 2 divisors, whose sum is σ = 28211480310. Its totient is φ = 28211480308.

The previous prime is 28211480279. The next prime is 28211480333. The reversal of 28211480309 is 90308411282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24634244209 + 3577236100 = 156953^2 + 59810^2 .

It is a cyclic number.

It is not a de Polignac number, because 28211480309 - 2¹² = 28211476213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28211489309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14105740154 + 14105740155.

It is an arithmetic number, because the mean of its divisors is an integer number (14105740155).

Almost surely, 2^28211480309 is an apocalyptic number.

It is an amenable number.

28211480309 is a deficient number, since it is larger than the sum of its proper divisors (1).

28211480309 is an equidigital number, since it uses as much as digits as its factorization.

28211480309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 28211480309 in words is "twenty-eight billion, two hundred eleven million, four hundred eighty thousand, three hundred nine".