30993664 has 72 divisors (see below), whose sum is σ = 68106080. Its totient is φ = 13989888.

The previous prime is 30993661. The next prime is 30993667. The reversal of 30993664 is 46639903.

It is an interprime number because it is at equal distance from previous prime (30993661) and next prime (30993667).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30993661) 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, 222907 + ... + 223045.

Almost surely, 2^30993664 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 30993664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34053040).

30993664 is an abundant number, since it is smaller than the sum of its proper divisors (37112416).

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

30993664 is a wasteful number, since it uses less digits than its factorization.

30993664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 40.

The square root of 30993664 is about 5567.1953441567. The cubic root of 30993664 is about 314.1166618585.

The spelling of 30993664 in words is "thirty million, nine hundred ninety-three thousand, six hundred sixty-four".