30688880 has 20 divisors (see below), whose sum is σ = 71351832. Its totient is φ = 12275520.

The previous prime is 30688871. The next prime is 30688883. The reversal of 30688880 is 8888603.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30688883) 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 3 ways as a sum of consecutive naturals, for example, 191726 + ... + 191885.

Almost surely, 2^30688880 is an apocalyptic number.

It is an amenable number.

30688880 is an abundant number, since it is smaller than the sum of its proper divisors (40662952).

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

30688880 is a wasteful number, since it uses less digits than its factorization.

30688880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383624 (or 383618 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 30688880 is about 5539.7545071961. The cubic root of 30688880 is about 313.0836197630.

The spelling of 30688880 in words is "thirty million, six hundred eighty-eight thousand, eight hundred eighty".