728281 has 2 divisors, whose sum is σ = 728282. Its totient is φ = 728280.

The previous prime is 728269. The next prime is 728293. The reversal of 728281 is 182827.

It is a balanced prime because it is at equal distance from previous prime (728269) and next prime (728293).

It can be written as a sum of positive squares in only one way, i.e., 435600 + 292681 = 660^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 728281 - 2¹³ = 720089 is a prime.

It is a super-2 number, since 2×728281² = 1060786429922, which contains 22 as substring.

728281 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364140 + 364141.

It is an arithmetic number, because the mean of its divisors is an integer number (364141).

2⁷²⁸²⁸¹ is an apocalyptic number.

It is an amenable number.

728281 is a deficient number, since it is larger than the sum of its proper divisors (1).

728281 is an equidigital number, since it uses as much as digits as its factorization.

728281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 28.

The square root of 728281 is about 853.3938129609. The cubic root of 728281 is about 89.9704017898.

The spelling of 728281 in words is "seven hundred twenty-eight thousand, two hundred eighty-one".