28726447877 has 2 divisors, whose sum is σ = 28726447878. Its totient is φ = 28726447876.

The previous prime is 28726447831. The next prime is 28726447949. The reversal of 28726447877 is 77874462782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23016227521 + 5710220356 = 151711^2 + 75566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28726447877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28726447777) 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, 14363223938 + 14363223939.

It is an arithmetic number, because the mean of its divisors is an integer number (14363223939).

Almost surely, 2^28726447877 is an apocalyptic number.

It is an amenable number.

28726447877 is a deficient number, since it is larger than the sum of its proper divisors (1).

28726447877 is an equidigital number, since it uses as much as digits as its factorization.

28726447877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59006976, while the sum is 62.

The spelling of 28726447877 in words is "twenty-eight billion, seven hundred twenty-six million, four hundred forty-seven thousand, eight hundred seventy-seven".