305129728 has 36 divisors (see below), whose sum is σ = 610461040. Its totient is φ = 152216064.

The previous prime is 305129711. The next prime is 305129731. The reversal of 305129728 is 827921503.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138943 + ... + 141121.

Almost surely, 2^305129728 is an apocalyptic number.

It is an amenable number.

305129728 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

305129728 is an equidigital number, since it uses as much as digits as its factorization.

305129728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2742 (or 2728 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 305129728 is about 17467.9629035558. The cubic root of 305129728 is about 673.2269722750.

The spelling of 305129728 in words is "three hundred five million, one hundred twenty-nine thousand, seven hundred twenty-eight".