728068531 has 2 divisors, whose sum is σ = 728068532. Its totient is φ = 728068530.

The previous prime is 728068457. The next prime is 728068541. The reversal of 728068531 is 135860827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728068531 - 2¹⁹ = 727544243 is a prime.

It is a super-2 number, since 2×728068531² = 1060167571664995922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (728068541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364034265 + 364034266.

It is an arithmetic number, because the mean of its divisors is an integer number (364034266).

Almost surely, 2^728068531 is an apocalyptic number.

728068531 is a deficient number, since it is larger than the sum of its proper divisors (1).

728068531 is an equidigital number, since it uses as much as digits as its factorization.

728068531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 728068531 is about 26982.7450605012. The cubic root of 728068531 is about 899.6165160471.

The spelling of 728068531 in words is "seven hundred twenty-eight million, sixty-eight thousand, five hundred thirty-one".