728825716721 has 16 divisors (see below), whose sum is σ = 768420280320. Its totient is φ = 690239413440.

The previous prime is 728825716603. The next prime is 728825716741. The reversal of 728825716721 is 127617528827.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728825716721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728825716741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20072435 + ... + 20108711.

It is an arithmetic number, because the mean of its divisors is an integer number (48026267520).

Almost surely, 2^728825716721 is an apocalyptic number.

It is an amenable number.

728825716721 is a deficient number, since it is larger than the sum of its proper divisors (39594563599).

728825716721 is a wasteful number, since it uses less digits than its factorization.

728825716721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50144.

The product of its digits is 5268480, while the sum is 56.

The spelling of 728825716721 in words is "seven hundred twenty-eight billion, eight hundred twenty-five million, seven hundred sixteen thousand, seven hundred twenty-one".