728998809 has 16 divisors (see below), whose sum is σ = 1211842560. Its totient is φ = 378700560.

The previous prime is 728998789. The next prime is 728998841. The reversal of 728998809 is 908899827.

It is not a de Polignac number, because 728998809 - 2¹⁵ = 728966041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728998849) 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 15 ways as a sum of consecutive naturals, for example, 1577689 + ... + 1578150.

It is an arithmetic number, because the mean of its divisors is an integer number (75740160).

Almost surely, 2^728998809 is an apocalyptic number.

It is an amenable number.

728998809 is a deficient number, since it is larger than the sum of its proper divisors (482843751).

728998809 is a wasteful number, since it uses less digits than its factorization.

728998809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3155860.

The product of its (nonzero) digits is 5225472, while the sum is 60.

The square root of 728998809 is about 26999.9779444354. The cubic root of 728998809 is about 899.9995098763. Note that the first 3 decimals are identical.

The spelling of 728998809 in words is "seven hundred twenty-eight million, nine hundred ninety-eight thousand, eight hundred nine".