30961988 has 24 divisors (see below), whose sum is σ = 55248480. Its totient is φ = 15179840.

The previous prime is 30961951. The next prime is 30961991. The reversal of 30961988 is 88916903.

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 7 ways as a sum of consecutive naturals, for example, 59168 + ... + 59688.

It is an arithmetic number, because the mean of its divisors is an integer number (2302020).

Almost surely, 2^30961988 is an apocalyptic number.

It is an amenable number.

30961988 is a deficient number, since it is larger than the sum of its proper divisors (24286492).

30961988 is a wasteful number, since it uses less digits than its factorization.

30961988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 30961988 is about 5564.3497373907. The cubic root of 30961988 is about 314.0096147001.

The spelling of 30961988 in words is "thirty million, nine hundred sixty-one thousand, nine hundred eighty-eight".