728562281 has 2 divisors, whose sum is σ = 728562282. Its totient is φ = 728562280.

The previous prime is 728562193. The next prime is 728562293. The reversal of 728562281 is 182265827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 471280681 + 257281600 = 21709^2 + 16040^2 .

It is an emirp because it is prime and its reverse (182265827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728562281 - 2¹⁰ = 728561257 is a prime.

It is a super-2 number, since 2×728562281² = 1061605994591845922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (728565281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364281140 + 364281141.

It is an arithmetic number, because the mean of its divisors is an integer number (364281141).

Almost surely, 2^728562281 is an apocalyptic number.

It is an amenable number.

728562281 is a deficient number, since it is larger than the sum of its proper divisors (1).

728562281 is an equidigital number, since it uses as much as digits as its factorization.

728562281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 41.

The square root of 728562281 is about 26991.8928754543. The cubic root of 728562281 is about 899.8198326597.

The spelling of 728562281 in words is "seven hundred twenty-eight million, five hundred sixty-two thousand, two hundred eighty-one".