305680728 has 16 divisors (see below), whose sum is σ = 764201880. Its totient is φ = 101893568.

The previous prime is 305680709. The next prime is 305680751. The reversal of 305680728 is 827086503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6368325 + ... + 6368372.

Almost surely, 2^305680728 is an apocalyptic number.

It is an amenable number.

305680728 is an abundant number, since it is smaller than the sum of its proper divisors (458521152).

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

305680728 is a wasteful number, since it uses less digits than its factorization.

305680728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12736706 (or 12736702 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 305680728 is about 17483.7275201829. The cubic root of 305680728 is about 673.6319639521.

The spelling of 305680728 in words is "three hundred five million, six hundred eighty thousand, seven hundred twenty-eight".