728820636 has 12 divisors (see below), whose sum is σ = 1700581512. Its totient is φ = 242940208.

The previous prime is 728820629. The next prime is 728820641. The reversal of 728820636 is 636028827.

It is a tau number, because it is divible by the number of its divisors (12).

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, 30367515 + ... + 30367538.

It is an arithmetic number, because the mean of its divisors is an integer number (141715126).

Almost surely, 2^728820636 is an apocalyptic number.

It is an amenable number.

728820636 is an abundant number, since it is smaller than the sum of its proper divisors (971760876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

728820636 is a wasteful number, since it uses less digits than its factorization.

728820636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60735060 (or 60735058 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 728820636 is about 26996.6782401095. The cubic root of 728820636 is about 899.9261815999.

The spelling of 728820636 in words is "seven hundred twenty-eight million, eight hundred twenty thousand, six hundred thirty-six".