728754228 has 36 divisors (see below), whose sum is σ = 1843349508. Its totient is φ = 242757120.

The previous prime is 728754227. The next prime is 728754233. The reversal of 728754228 is 822457827.

728754228 is a `hidden beast` number, since 7 + 2 + 87 + 542 + 28 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 346629924 + 382124304 = 18618^2 + 19548^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728754227) 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 11 ways as a sum of consecutive naturals, for example, 56548 + ... + 68228.

It is an arithmetic number, because the mean of its divisors is an integer number (51204153).

Almost surely, 2^728754228 is an apocalyptic number.

It is an amenable number.

728754228 is an abundant number, since it is smaller than the sum of its proper divisors (1114595280).

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

728754228 is a wasteful number, since it uses less digits than its factorization.

728754228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13424 (or 13419 counting only the distinct ones).

The product of its digits is 501760, while the sum is 45.

The square root of 728754228 is about 26995.4482829976. The cubic root of 728754228 is about 899.8988478911.

The spelling of 728754228 in words is "seven hundred twenty-eight million, seven hundred fifty-four thousand, two hundred twenty-eight".