305428872 has 64 divisors (see below), whose sum is σ = 874166400. Its totient is φ = 87114240.

The previous prime is 305428867. The next prime is 305428873. The reversal of 305428872 is 278824503.

It is a self number, because there is not a number n which added to its sum of digits gives 305428872.

It is not an unprimeable number, because it can be changed into a prime (305428873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126654 + ... + 129042.

It is an arithmetic number, because the mean of its divisors is an integer number (13658850).

Almost surely, 2^305428872 is an apocalyptic number.

It is an amenable number.

305428872 is an abundant number, since it is smaller than the sum of its proper divisors (568737528).

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

305428872 is a wasteful number, since it uses less digits than its factorization.

305428872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3166 (or 3162 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 39.

The square root of 305428872 is about 17476.5234529068. The cubic root of 305428872 is about 673.4469071782.

The spelling of 305428872 in words is "three hundred five million, four hundred twenty-eight thousand, eight hundred seventy-two".