728889638 has 8 divisors (see below), whose sum is σ = 1098829200. Its totient is φ = 362613240.

The previous prime is 728889617. The next prime is 728889691. The reversal of 728889638 is 836988827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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, 915293 + ... + 916088.

It is an arithmetic number, because the mean of its divisors is an integer number (137353650).

Almost surely, 2^728889638 is an apocalyptic number.

728889638 is a deficient number, since it is larger than the sum of its proper divisors (369939562).

728889638 is a wasteful number, since it uses less digits than its factorization.

728889638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831582.

The product of its digits is 9289728, while the sum is 59.

The square root of 728889638 is about 26997.9561819038. The cubic root of 728889638 is about 899.9545812471.

The spelling of 728889638 in words is "seven hundred twenty-eight million, eight hundred eighty-nine thousand, six hundred thirty-eight".