28726447949 has 2 divisors, whose sum is σ = 28726447950. Its totient is φ = 28726447948.

The previous prime is 28726447877. The next prime is 28726447961. The reversal of 28726447949 is 94974462782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21621643849 + 7104804100 = 147043^2 + 84290^2 .

It is a cyclic number.

It is not a de Polignac number, because 28726447949 - 2¹⁶ = 28726382413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28726447891 and 28726447900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28726447049) 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, 14363223974 + 14363223975.

It is an arithmetic number, because the mean of its divisors is an integer number (14363223975).

Almost surely, 2^28726447949 is an apocalyptic number.

It is an amenable number.

28726447949 is a deficient number, since it is larger than the sum of its proper divisors (1).

28726447949 is an equidigital number, since it uses as much as digits as its factorization.

28726447949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48771072, while the sum is 62.

The spelling of 28726447949 in words is "twenty-eight billion, seven hundred twenty-six million, four hundred forty-seven thousand, nine hundred forty-nine".