30728223 has 24 divisors (see below), whose sum is σ = 46107776. Its totient is φ = 19699200.

The previous prime is 30728219. The next prime is 30728227. The reversal of 30728223 is 32282703.

It is an interprime number because it is at equal distance from previous prime (30728219) and next prime (30728227).

It is not a de Polignac number, because 30728223 - 2² = 30728219 is a prime.

It is a Duffinian number.

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 (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67011 + ... + 67467.

Almost surely, 2^30728223 is an apocalyptic number.

30728223 is a deficient number, since it is larger than the sum of its proper divisors (15379553).

30728223 is a wasteful number, since it uses less digits than its factorization.

30728223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 30728223 is about 5543.3043394712. The cubic root of 30728223 is about 313.2173532073.

The spelling of 30728223 in words is "thirty million, seven hundred twenty-eight thousand, two hundred twenty-three".