30328821 has 6 divisors (see below), whose sum is σ = 43808310. Its totient is φ = 20219208.

The previous prime is 30328813. The next prime is 30328847. The reversal of 30328821 is 12882303.

It can be written as a sum of positive squares in only one way, i.e., 27941796 + 2387025 = 5286^2 + 1545^2 .

It is not a de Polignac number, because 30328821 - 2³ = 30328813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30328871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1684926 + ... + 1684943.

It is an arithmetic number, because the mean of its divisors is an integer number (7301385).

Almost surely, 2^30328821 is an apocalyptic number.

It is an amenable number.

30328821 is a deficient number, since it is larger than the sum of its proper divisors (13479489).

30328821 is a wasteful number, since it uses less digits than its factorization.

30328821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3369875 (or 3369872 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 30328821 is about 5507.1608837948. The cubic root of 30328821 is about 311.8543760751.

The spelling of 30328821 in words is "thirty million, three hundred twenty-eight thousand, eight hundred twenty-one".