728543140 has 24 divisors (see below), whose sum is σ = 1647628920. Its totient is φ = 269000448.

The previous prime is 728543131. The next prime is 728543161. The reversal of 728543140 is 41345827.

It can be written as a sum of positive squares in 4 ways, for example, as 31899904 + 696643236 = 5648^2 + 26394^2 .

It is a junction number, because it is equal to n+sod(n) for n = 728543096 and 728543105.

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 7 ways as a sum of consecutive naturals, for example, 1400785 + ... + 1401304.

It is an arithmetic number, because the mean of its divisors is an integer number (68651205).

Almost surely, 2^728543140 is an apocalyptic number.

It is an amenable number.

728543140 is an abundant number, since it is smaller than the sum of its proper divisors (919085780).

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

728543140 is a wasteful number, since it uses less digits than its factorization.

728543140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802111 (or 2802109 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 728543140 is about 26991.5383036981. The cubic root of 728543140 is about 899.8119524813.

Adding to 728543140 its reverse (41345827), we get a palindrome (769888967).

The spelling of 728543140 in words is "seven hundred twenty-eight million, five hundred forty-three thousand, one hundred forty".