30685886 has 32 divisors (see below), whose sum is σ = 59374080. Its totient is φ = 11541600.

The previous prime is 30685883. The next prime is 30685903. The reversal of 30685886 is 68858603.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30685883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1031 + ... + 7901.

It is an arithmetic number, because the mean of its divisors is an integer number (1855440).

Almost surely, 2^30685886 is an apocalyptic number.

30685886 is a deficient number, since it is larger than the sum of its proper divisors (28688194).

30685886 is a wasteful number, since it uses less digits than its factorization.

30685886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6920.

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 30685886 is about 5539.4842720239. The cubic root of 30685886 is about 313.0734379768.

The spelling of 30685886 in words is "thirty million, six hundred eighty-five thousand, eight hundred eighty-six".