30828321 has 12 divisors (see below), whose sum is σ = 44925348. Its totient is φ = 20369664.

The previous prime is 30828319. The next prime is 30828323. The reversal of 30828321 is 12382803.

It is an interprime number because it is at equal distance from previous prime (30828319) and next prime (30828323).

It can be written as a sum of positive squares in 2 ways, for example, as 12680721 + 18147600 = 3561^2 + 4260^2 .

It is not a de Polignac number, because 30828321 - 2¹ = 30828319 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30828323) 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 11 ways as a sum of consecutive naturals, for example, 14140 + ... + 16173.

It is an arithmetic number, because the mean of its divisors is an integer number (3743779).

Almost surely, 2^30828321 is an apocalyptic number.

It is an amenable number.

30828321 is a deficient number, since it is larger than the sum of its proper divisors (14097027).

30828321 is a wasteful number, since it uses less digits than its factorization.

30828321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30432 (or 30429 counting only the distinct ones).

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

The square root of 30828321 is about 5552.3257289176. The cubic root of 30828321 is about 313.5570891813.

The spelling of 30828321 in words is "thirty million, eight hundred twenty-eight thousand, three hundred twenty-one".