728647304729 has 4 divisors (see below), whose sum is σ = 728801259876. Its totient is φ = 728493349584.

The previous prime is 728647304719. The next prime is 728647304743. The reversal of 728647304729 is 927403746827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 84536725504 + 644110579225 = 290752^2 + 802565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728647304729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728647304719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76970474 + ... + 76979939.

It is an arithmetic number, because the mean of its divisors is an integer number (182200314969).

Almost surely, 2^728647304729 is an apocalyptic number.

It is an amenable number.

728647304729 is a deficient number, since it is larger than the sum of its proper divisors (153955147).

728647304729 is a wasteful number, since it uses less digits than its factorization.

728647304729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153955146.

The product of its (nonzero) digits is 28449792, while the sum is 59.

The spelling of 728647304729 in words is "seven hundred twenty-eight billion, six hundred forty-seven million, three hundred four thousand, seven hundred twenty-nine".