30939568 has 40 divisors (see below), whose sum is σ = 65710080. Its totient is φ = 13995840.

The previous prime is 30939553. The next prime is 30939569. The reversal of 30939568 is 86593903.

It is not an unprimeable number, because it can be changed into a prime (30939569) 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 7 ways as a sum of consecutive naturals, for example, 64353 + ... + 64831.

It is an arithmetic number, because the mean of its divisors is an integer number (1642752).

Almost surely, 2^30939568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30939568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32855040).

30939568 is an abundant number, since it is smaller than the sum of its proper divisors (34770512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30939568 is a wasteful number, since it uses less digits than its factorization.

30939568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 30939568 is about 5562.3347615907. The cubic root of 30939568 is about 313.9338035095.

The spelling of 30939568 in words is "thirty million, nine hundred thirty-nine thousand, five hundred sixty-eight".