30728506 has 32 divisors (see below), whose sum is σ = 50139648. Its totient is φ = 14087040.

The previous prime is 30728497. The next prime is 30728521. The reversal of 30728506 is 60582703.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 131766 + ... + 131998.

It is an arithmetic number, because the mean of its divisors is an integer number (1566864).

Almost surely, 2^30728506 is an apocalyptic number.

30728506 is a deficient number, since it is larger than the sum of its proper divisors (19411142).

30728506 is a wasteful number, since it uses less digits than its factorization.

30728506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 30728506 is about 5543.3298657035. The cubic root of 30728506 is about 313.2183147581.

The spelling of 30728506 in words is "thirty million, seven hundred twenty-eight thousand, five hundred six".