728499889 has 8 divisors (see below), whose sum is σ = 789805800. Its totient is φ = 667946496.

The previous prime is 728499887. The next prime is 728499949. The reversal of 728499889 is 988994827.

It can be written as a sum of positive squares in 4 ways, for example, as 81306289 + 647193600 = 9017^2 + 25440^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 728499889 - 2¹ = 728499887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 728499889.

It is not an unprimeable number, because it can be changed into a prime (728499883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186112 + ... + 189985.

It is an arithmetic number, because the mean of its divisors is an integer number (98725725).

Almost surely, 2^728499889 is an apocalyptic number.

It is an amenable number.

728499889 is a deficient number, since it is larger than the sum of its proper divisors (61305911).

728499889 is a wasteful number, since it uses less digits than its factorization.

728499889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376259.

The product of its digits is 20901888, while the sum is 64.

The square root of 728499889 is about 26990.7370962706. The cubic root of 728499889 is about 899.7941459234.

The spelling of 728499889 in words is "seven hundred twenty-eight million, four hundred ninety-nine thousand, eight hundred eighty-nine".