30990868 has 24 divisors (see below), whose sum is σ = 55218240. Its totient is φ = 15216960.

The previous prime is 30990863. The next prime is 30990887. The reversal of 30990868 is 86809903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30990863) 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, 93463 + ... + 93793.

It is an arithmetic number, because the mean of its divisors is an integer number (2300760).

Almost surely, 2^30990868 is an apocalyptic number.

It is an amenable number.

30990868 is a deficient number, since it is larger than the sum of its proper divisors (24227372).

30990868 is a wasteful number, since it uses less digits than its factorization.

30990868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687 (or 685 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 30990868 is about 5566.9442246173. The cubic root of 30990868 is about 314.1072158784.

The spelling of 30990868 in words is "thirty million, nine hundred ninety thousand, eight hundred sixty-eight".