728703845 has 4 divisors (see below), whose sum is σ = 874444620. Its totient is φ = 582963072.

The previous prime is 728703841. The next prime is 728703847. The reversal of 728703845 is 548307827.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548307827 = 59 ⋅9293353.

It can be written as a sum of positive squares in 2 ways, for example, as 254945089 + 473758756 = 15967^2 + 21766^2 .

It is a cyclic number.

It is not a de Polignac number, because 728703845 - 2² = 728703841 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 728703796 and 728703805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728703841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72870380 + ... + 72870389.

It is an arithmetic number, because the mean of its divisors is an integer number (218611155).

Almost surely, 2^728703845 is an apocalyptic number.

It is an amenable number.

728703845 is a deficient number, since it is larger than the sum of its proper divisors (145740775).

728703845 is a wasteful number, since it uses less digits than its factorization.

728703845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145740774.

The product of its (nonzero) digits is 376320, while the sum is 44.

The square root of 728703845 is about 26994.5150910328. The cubic root of 728703845 is about 899.8781090069.

The spelling of 728703845 in words is "seven hundred twenty-eight million, seven hundred three thousand, eight hundred forty-five".