728365538 has 16 divisors (see below), whose sum is σ = 1115747136. Its totient is φ = 356481840.

The previous prime is 728365529. The next prime is 728365579. The reversal of 728365538 is 835563827.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 728365492 and 728365501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39203 + ... + 54713.

It is an arithmetic number, because the mean of its divisors is an integer number (69734196).

Almost surely, 2^728365538 is an apocalyptic number.

728365538 is a deficient number, since it is larger than the sum of its proper divisors (387381598).

728365538 is a wasteful number, since it uses less digits than its factorization.

728365538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16009.

The product of its digits is 1209600, while the sum is 47.

The square root of 728365538 is about 26988.2481461839. The cubic root of 728365538 is about 899.7388287447.

The spelling of 728365538 in words is "seven hundred twenty-eight million, three hundred sixty-five thousand, five hundred thirty-eight".