728351345 has 4 divisors (see below), whose sum is σ = 874021620. Its totient is φ = 582681072.

The previous prime is 728351341. The next prime is 728351353. The reversal of 728351345 is 543153827.

728351345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 513113104 + 215238241 = 22652^2 + 14671^2 .

It is a cyclic number.

It is not a de Polignac number, because 728351345 - 2² = 728351341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 728351299 and 728351308.

It is not an unprimeable number, because it can be changed into a prime (728351341) 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, 72835130 + ... + 72835139.

It is an arithmetic number, because the mean of its divisors is an integer number (218505405).

Almost surely, 2^728351345 is an apocalyptic number.

It is an amenable number.

728351345 is a deficient number, since it is larger than the sum of its proper divisors (145670275).

728351345 is a wasteful number, since it uses less digits than its factorization.

728351345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145670274.

The product of its digits is 100800, while the sum is 38.

The square root of 728351345 is about 26987.9851971206. The cubic root of 728351345 is about 899.7329845747.

The spelling of 728351345 in words is "seven hundred twenty-eight million, three hundred fifty-one thousand, three hundred forty-five".