728579261 has 2 divisors, whose sum is σ = 728579262. Its totient is φ = 728579260.

The previous prime is 728579249. The next prime is 728579297. The reversal of 728579261 is 162975827.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 718776100 + 9803161 = 26810^2 + 3131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728579261 is a prime.

It is a super-2 number, since 2×728579261² = 1061655479118612242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728579231) 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, 364289630 + 364289631.

It is an arithmetic number, because the mean of its divisors is an integer number (364289631).

Almost surely, 2^728579261 is an apocalyptic number.

It is an amenable number.

728579261 is a deficient number, since it is larger than the sum of its proper divisors (1).

728579261 is an equidigital number, since it uses as much as digits as its factorization.

728579261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 47.

The square root of 728579261 is about 26992.2074125107. The cubic root of 728579261 is about 899.8268230582.

The spelling of 728579261 in words is "seven hundred twenty-eight million, five hundred seventy-nine thousand, two hundred sixty-one".