728058128257 has 4 divisors (see below), whose sum is σ = 770885076996. Its totient is φ = 685231179520.

The previous prime is 728058128249. The next prime is 728058128261. The reversal of 728058128257 is 752821850827.

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 305942840641 + 422115287616 = 553121^2 + 649704^2 .

It is a cyclic number.

It is not a de Polignac number, because 728058128257 - 2³ = 728058128249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728058128198 and 728058128207.

It is not an unprimeable number, because it can be changed into a prime (728058123257) 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, 21413474344 + ... + 21413474377.

It is an arithmetic number, because the mean of its divisors is an integer number (192721269249).

Almost surely, 2^728058128257 is an apocalyptic number.

It is an amenable number.

728058128257 is a deficient number, since it is larger than the sum of its proper divisors (42826948739).

728058128257 is a wasteful number, since it uses less digits than its factorization.

728058128257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42826948738.

The product of its (nonzero) digits is 5017600, while the sum is 55.

The spelling of 728058128257 in words is "seven hundred twenty-eight billion, fifty-eight million, one hundred twenty-eight thousand, two hundred fifty-seven".