30685906 has 8 divisors (see below), whose sum is σ = 46200780. Its totient is φ = 15285648.

The previous prime is 30685903. The next prime is 30685909. The reversal of 30685906 is 60958603.

It is an interprime number because it is at equal distance from previous prime (30685903) and next prime (30685909).

It can be written as a sum of positive squares in 2 ways, for example, as 22896225 + 7789681 = 4785^2 + 2791^2 .

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 (30685903) 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, 27981 + ... + 29056.

Almost surely, 2^30685906 is an apocalyptic number.

30685906 is a deficient number, since it is larger than the sum of its proper divisors (15514874).

30685906 is a wasteful number, since it uses less digits than its factorization.

30685906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57308.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 30685906 is about 5539.4860772458. The cubic root of 30685906 is about 313.0735059936.

The spelling of 30685906 in words is "thirty million, six hundred eighty-five thousand, nine hundred six".