305000028 has 72 divisors (see below), whose sum is σ = 805437360. Its totient is φ = 97217280.

The previous prime is 304999993. The next prime is 305000053. The reversal of 305000028 is 820000503.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76648 + ... + 80528.

It is an arithmetic number, because the mean of its divisors is an integer number (11186630).

Almost surely, 2^305000028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 305000028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (402718680).

305000028 is an abundant number, since it is smaller than the sum of its proper divisors (500437332).

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

305000028 is a wasteful number, since it uses less digits than its factorization.

305000028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3987 (or 3982 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 305000028 is about 17464.2499982106. The cubic root of 305000028 is about 673.1315703251.

The spelling of 305000028 in words is "three hundred five million, twenty-eight", and thus it is an aban number.