728209240 has 32 divisors (see below), whose sum is σ = 1787423760. Its totient is φ = 264803200.

The previous prime is 728209201. The next prime is 728209267. The reversal of 728209240 is 42902827.

It is a junction number, because it is equal to n+sod(n) for n = 728209196 and 728209205.

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 7 ways as a sum of consecutive naturals, for example, 827071 + ... + 827950.

Almost surely, 2^728209240 is an apocalyptic number.

It is an amenable number.

728209240 is an abundant number, since it is smaller than the sum of its proper divisors (1059214520).

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

728209240 is a wasteful number, since it uses less digits than its factorization.

728209240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655043 (or 1655039 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 728209240 is about 26985.3523230659. The cubic root of 728209240 is about 899.6744666297.

The spelling of 728209240 in words is "seven hundred twenty-eight million, two hundred nine thousand, two hundred forty".