728051605 has 16 divisors (see below), whose sum is σ = 929049264. Its totient is φ = 545812480.

The previous prime is 728051581. The next prime is 728051629. The reversal of 728051605 is 506150827.

It is an interprime number because it is at equal distance from previous prime (728051581) and next prime (728051629).

It can be written as a sum of positive squares in 8 ways, for example, as 133033156 + 595018449 = 11534^2 + 24393^2 .

It is not a de Polignac number, because 728051605 - 2⁷ = 728051477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 1425 + ... + 38185.

It is an arithmetic number, because the mean of its divisors is an integer number (58065579).

Almost surely, 2^728051605 is an apocalyptic number.

It is an amenable number.

728051605 is a deficient number, since it is larger than the sum of its proper divisors (200997659).

728051605 is a wasteful number, since it uses less digits than its factorization.

728051605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37016.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 728051605 is about 26982.4314137922. The cubic root of 728051605 is about 899.6095446214.

It can be divided in two parts, 7280 and 51605, that added together give a palindrome (58885).

The spelling of 728051605 in words is "seven hundred twenty-eight million, fifty-one thousand, six hundred five".