30666730 has 16 divisors (see below), whose sum is σ = 55821960. Its totient is φ = 12128512.

The previous prime is 30666689. The next prime is 30666739. The reversal of 30666730 is 3766603.

It can be written as a sum of positive squares in 4 ways, for example, as 22005481 + 8661249 = 4691^2 + 2943^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30666692 and 30666701.

It is not an unprimeable number, because it can be changed into a prime (30666739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16339 + ... + 18118.

Almost surely, 2^30666730 is an apocalyptic number.

30666730 is a deficient number, since it is larger than the sum of its proper divisors (25155230).

30666730 is a wasteful number, since it uses less digits than its factorization.

30666730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34553.

The product of its (nonzero) digits is 13608, while the sum is 31.

The square root of 30666730 is about 5537.7549602705. The cubic root of 30666730 is about 313.0082779099.

The spelling of 30666730 in words is "thirty million, six hundred sixty-six thousand, seven hundred thirty".