30993808 has 20 divisors (see below), whose sum is σ = 62122140. Its totient is φ = 14962304.

The previous prime is 30993797. The next prime is 30993863. The reversal of 30993808 is 80839903.

It can be written as a sum of positive squares in 2 ways, for example, as 11209104 + 19784704 = 3348^2 + 4448^2 .

It is a super-2 number, since 2×30993808² = 1921232268681728, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32935 + ... + 33862.

It is an arithmetic number, because the mean of its divisors is an integer number (3106107).

Almost surely, 2^30993808 is an apocalyptic number.

It is an amenable number.

30993808 is an abundant number, since it is smaller than the sum of its proper divisors (31128332).

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

30993808 is a wasteful number, since it uses less digits than its factorization.

30993808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66834 (or 66828 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 30993808 is about 5567.2082770451. The cubic root of 30993808 is about 314.1171483314.

The spelling of 30993808 in words is "thirty million, nine hundred ninety-three thousand, eight hundred eight".