28381267601 has 2 divisors, whose sum is σ = 28381267602. Its totient is φ = 28381267600.

The previous prime is 28381267531. The next prime is 28381267637. The reversal of 28381267601 is 10676218382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23096704576 + 5284563025 = 151976^2 + 72695^2 .

It is a cyclic number.

It is not a de Polignac number, because 28381267601 - 2²⁶ = 28314158737 is a prime.

It is not a weakly prime, because it can be changed into another prime (28381267001) 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, 14190633800 + 14190633801.

It is an arithmetic number, because the mean of its divisors is an integer number (14190633801).

Almost surely, 2^28381267601 is an apocalyptic number.

It is an amenable number.

28381267601 is a deficient number, since it is larger than the sum of its proper divisors (1).

28381267601 is an equidigital number, since it uses as much as digits as its factorization.

28381267601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 28381267601 in words is "twenty-eight billion, three hundred eighty-one million, two hundred sixty-seven thousand, six hundred one".