30938728 has 16 divisors (see below), whose sum is σ = 58574880. Its totient is φ = 15318768.

The previous prime is 30938717. The next prime is 30938731. The reversal of 30938728 is 82783903.

It is a happy number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 17950 + ... + 19597.

It is an arithmetic number, because the mean of its divisors is an integer number (3660930).

Almost surely, 2^30938728 is an apocalyptic number.

It is an amenable number.

30938728 is a deficient number, since it is larger than the sum of its proper divisors (27636152).

30938728 is a wasteful number, since it uses less digits than its factorization.

30938728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37656 (or 37652 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 30938728 is about 5562.2592532172. The cubic root of 30938728 is about 313.9309624142.

The spelling of 30938728 in words is "thirty million, nine hundred thirty-eight thousand, seven hundred twenty-eight".