30728229 has 32 divisors (see below), whose sum is σ = 48625920. Its totient is φ = 16896000.

The previous prime is 30728227. The next prime is 30728233. The reversal of 30728229 is 92282703.

It is not a de Polignac number, because 30728229 - 2¹ = 30728227 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30728229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30728227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76429 + ... + 76829.

It is an arithmetic number, because the mean of its divisors is an integer number (1519560).

Almost surely, 2^30728229 is an apocalyptic number.

It is an amenable number.

30728229 is a deficient number, since it is larger than the sum of its proper divisors (17897691).

30728229 is a wasteful number, since it uses less digits than its factorization.

30728229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 30728229 is about 5543.3048806646. The cubic root of 30728229 is about 313.2173735936.

The spelling of 30728229 in words is "thirty million, seven hundred twenty-eight thousand, two hundred twenty-nine".