30281968 has 20 divisors (see below), whose sum is σ = 58824360. Its totient is φ = 15101504.

The previous prime is 30281957. The next prime is 30281971. The reversal of 30281968 is 86918203.

It is a congruent 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, 4446 + ... + 8962.

It is an arithmetic number, because the mean of its divisors is an integer number (2941218).

Almost surely, 2^30281968 is an apocalyptic number.

It is an amenable number.

30281968 is a deficient number, since it is larger than the sum of its proper divisors (28542392).

30281968 is a wasteful number, since it uses less digits than its factorization.

30281968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4944 (or 4938 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 30281968 is about 5502.9054144152. The cubic root of 30281968 is about 311.6937055415.

The spelling of 30281968 in words is "thirty million, two hundred eighty-one thousand, nine hundred sixty-eight".