728256673 has 2 divisors, whose sum is σ = 728256674. Its totient is φ = 728256672.

The previous prime is 728256631. The next prime is 728256679. The reversal of 728256673 is 376652827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 674337024 + 53919649 = 25968^2 + 7343^2 .

It is a cyclic number.

It is not a de Polignac number, because 728256673 - 2²⁵ = 694702241 is a prime.

It is not a weakly prime, because it can be changed into another prime (728256679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364128336 + 364128337.

It is an arithmetic number, because the mean of its divisors is an integer number (364128337).

Almost surely, 2^728256673 is an apocalyptic number.

It is an amenable number.

728256673 is a deficient number, since it is larger than the sum of its proper divisors (1).

728256673 is an equidigital number, since it uses as much as digits as its factorization.

728256673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 46.

The square root of 728256673 is about 26986.2311744341. The cubic root of 728256673 is about 899.6940000871.

The spelling of 728256673 in words is "seven hundred twenty-eight million, two hundred fifty-six thousand, six hundred seventy-three".