728273261 has 2 divisors, whose sum is σ = 728273262. Its totient is φ = 728273260.

The previous prime is 728273243. The next prime is 728273267. The reversal of 728273261 is 162372827.

728273261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620508100 + 107765161 = 24910^2 + 10381^2 .

It is a cyclic number.

It is not a de Polignac number, because 728273261 - 2⁶ = 728273197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728273267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364136630 + 364136631.

It is an arithmetic number, because the mean of its divisors is an integer number (364136631).

Almost surely, 2^728273261 is an apocalyptic number.

It is an amenable number.

728273261 is a deficient number, since it is larger than the sum of its proper divisors (1).

728273261 is an equidigital number, since it uses as much as digits as its factorization.

728273261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 38.

The square root of 728273261 is about 26986.5385146002. The cubic root of 728273261 is about 899.7008310169.

The spelling of 728273261 in words is "seven hundred twenty-eight million, two hundred seventy-three thousand, two hundred sixty-one".