728905589 has 2 divisors, whose sum is σ = 728905590. Its totient is φ = 728905588.

The previous prime is 728905579. The next prime is 728905601. The reversal of 728905589 is 985509827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 723879025 + 5026564 = 26905^2 + 2242^2 .

It is an emirp because it is prime and its reverse (985509827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728905589 - 2¹² = 728901493 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 728905589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728905579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364452794 + 364452795.

It is an arithmetic number, because the mean of its divisors is an integer number (364452795).

Almost surely, 2^728905589 is an apocalyptic number.

It is an amenable number.

728905589 is a deficient number, since it is larger than the sum of its proper divisors (1).

728905589 is an equidigital number, since it uses as much as digits as its factorization.

728905589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The square root of 728905589 is about 26998.2515915383. The cubic root of 728905589 is about 899.9611460593.

The spelling of 728905589 in words is "seven hundred twenty-eight million, nine hundred five thousand, five hundred eighty-nine".