728208403 has 4 divisors (see below), whose sum is σ = 784224448. Its totient is φ = 672192360.

The previous prime is 728208367. The next prime is 728208407. The reversal of 728208403 is 304802827.

728208403 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 is a cyclic number.

It is not a de Polignac number, because 728208403 - 2¹⁷ = 728077331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728208407) 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, 28008003 + ... + 28008028.

It is an arithmetic number, because the mean of its divisors is an integer number (196056112).

Almost surely, 2^728208403 is an apocalyptic number.

728208403 is a deficient number, since it is larger than the sum of its proper divisors (56016045).

728208403 is a wasteful number, since it uses less digits than its factorization.

728208403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56016044.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 728208403 is about 26985.3368146481. The cubic root of 728208403 is about 899.6741219358.

The spelling of 728208403 in words is "seven hundred twenty-eight million, two hundred eight thousand, four hundred three".