728221304 has 8 divisors (see below), whose sum is σ = 1365414960. Its totient is φ = 364110648.

The previous prime is 728221283. The next prime is 728221313. The reversal of 728221304 is 403122827.

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 45513824 + ... + 45513839.

It is an arithmetic number, because the mean of its divisors is an integer number (170676870).

Almost surely, 2^728221304 is an apocalyptic number.

It is an amenable number.

728221304 is a deficient number, since it is larger than the sum of its proper divisors (637193656).

728221304 is a wasteful number, since it uses less digits than its factorization.

728221304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91027669 (or 91027665 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 728221304 is about 26985.5758508133. The cubic root of 728221304 is about 899.6794348047.

The spelling of 728221304 in words is "seven hundred twenty-eight million, two hundred twenty-one thousand, three hundred four".