28743391009 has 2 divisors, whose sum is σ = 28743391010. Its totient is φ = 28743391008.

The previous prime is 28743390983. The next prime is 28743391073. The reversal of 28743391009 is 90019334782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17073342225 + 11670048784 = 130665^2 + 108028^2 .

It is a cyclic number.

It is not a de Polignac number, because 28743391009 - 2³¹ = 26595907361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28743391009.

It is not a weakly prime, because it can be changed into another prime (28743391909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14371695504 + 14371695505.

It is an arithmetic number, because the mean of its divisors is an integer number (14371695505).

Almost surely, 2^28743391009 is an apocalyptic number.

It is an amenable number.

28743391009 is a deficient number, since it is larger than the sum of its proper divisors (1).

28743391009 is an equidigital number, since it uses as much as digits as its factorization.

28743391009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 28743391009 in words is "twenty-eight billion, seven hundred forty-three million, three hundred ninety-one thousand, nine".