243680728 has 8 divisors (see below), whose sum is σ = 456901380. Its totient is φ = 121840360.

The previous prime is 243680713. The next prime is 243680729. The reversal of 243680728 is 827086342.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243680729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15230038 + ... + 15230053.

Almost surely, 2^243680728 is an apocalyptic number.

It is an amenable number.

243680728 is a deficient number, since it is larger than the sum of its proper divisors (213220652).

243680728 is a wasteful number, since it uses less digits than its factorization.

243680728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30460097 (or 30460093 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 243680728 is about 15610.2763588605. The cubic root of 243680728 is about 624.6073078803.

The spelling of 243680728 in words is "two hundred forty-three million, six hundred eighty thousand, seven hundred twenty-eight".