30820666 has 8 divisors (see below), whose sum is σ = 47103444. Its totient is φ = 15119520.

The previous prime is 30820661. The next prime is 30820687. The reversal of 30820666 is 66602803.

It can be written as a sum of positive squares in 2 ways, for example, as 29430625 + 1390041 = 5425^2 + 1179^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (30820661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145275 + ... + 145486.

Almost surely, 2^30820666 is an apocalyptic number.

30820666 is a deficient number, since it is larger than the sum of its proper divisors (16282778).

30820666 is a wasteful number, since it uses less digits than its factorization.

30820666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290816.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 30820666 is about 5551.6363353519. The cubic root of 30820666 is about 313.5311338461.

The spelling of 30820666 in words is "thirty million, eight hundred twenty thousand, six hundred sixty-six".