28630305 has 24 divisors (see below), whose sum is σ = 54138240. Its totient is φ = 13881120.

The previous prime is 28630297. The next prime is 28630307. The reversal of 28630305 is 50303682.

28630305 is a `hidden beast` number, since 28 + 630 + 3 + 0 + 5 = 666.

It is not a de Polignac number, because 28630305 - 2³ = 28630297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28630307) 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 in 23 ways as a sum of consecutive naturals, for example, 28425 + ... + 29414.

It is an arithmetic number, because the mean of its divisors is an integer number (2255760).

Almost surely, 2^28630305 is an apocalyptic number.

It is an amenable number.

28630305 is a deficient number, since it is larger than the sum of its proper divisors (25507935).

28630305 is a wasteful number, since it uses less digits than its factorization.

28630305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57861 (or 57858 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 28630305 is about 5350.7293895319. The cubic root of 28630305 is about 305.9205547955.

Adding to 28630305 its reverse (50303682), we get a palindrome (78933987).

The spelling of 28630305 in words is "twenty-eight million, six hundred thirty thousand, three hundred five".