30666686 has 4 divisors (see below), whose sum is σ = 46000032. Its totient is φ = 15333342.

The previous prime is 30666679. The next prime is 30666689. The reversal of 30666686 is 68666603.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30666689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7666670 + ... + 7666673.

It is an arithmetic number, because the mean of its divisors is an integer number (11500008).

Almost surely, 2^30666686 is an apocalyptic number.

30666686 is a deficient number, since it is larger than the sum of its proper divisors (15333346).

30666686 is a wasteful number, since it uses less digits than its factorization.

30666686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15333345.

The product of its (nonzero) digits is 186624, while the sum is 41.

The square root of 30666686 is about 5537.7509875400. The cubic root of 30666686 is about 313.0081282105.

The spelling of 30666686 in words is "thirty million, six hundred sixty-six thousand, six hundred eighty-six".