30961388 has 12 divisors (see below), whose sum is σ = 54709200. Its totient is φ = 15330192.

The previous prime is 30961387. The next prime is 30961397. The reversal of 30961388 is 88316903.

It is not an unprimeable number, because it can be changed into a prime (30961387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37163 + ... + 37986.

It is an arithmetic number, because the mean of its divisors is an integer number (4559100).

Almost surely, 2^30961388 is an apocalyptic number.

It is an amenable number.

30961388 is a deficient number, since it is larger than the sum of its proper divisors (23747812).

30961388 is a wasteful number, since it uses less digits than its factorization.

30961388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75256 (or 75254 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 30961388 is about 5564.2958224739. The cubic root of 30961388 is about 314.0075863314.

The spelling of 30961388 in words is "thirty million, nine hundred sixty-one thousand, three hundred eighty-eight".