30666640 has 40 divisors (see below), whose sum is σ = 75497400. Its totient is φ = 11544576.

The previous prime is 30666619. The next prime is 30666667. The reversal of 30666640 is 4666603.

It can be written as a sum of positive squares in 4 ways, for example, as 16257024 + 14409616 = 4032^2 + 3796^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9915 + ... + 12634.

It is an arithmetic number, because the mean of its divisors is an integer number (1887435).

Almost surely, 2^30666640 is an apocalyptic number.

It is an amenable number.

30666640 is an abundant number, since it is smaller than the sum of its proper divisors (44830760).

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

30666640 is a wasteful number, since it uses less digits than its factorization.

30666640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22579 (or 22573 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 30666640 is about 5537.7468342278. The cubic root of 30666640 is about 313.0079717065.

The spelling of 30666640 in words is "thirty million, six hundred sixty-six thousand, six hundred forty".