30681886 has 4 divisors (see below), whose sum is σ = 46022832. Its totient is φ = 15340942.

The previous prime is 30681883. The next prime is 30681907. The reversal of 30681886 is 68818603.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30681883) 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 as a sum of consecutive naturals, namely, 7670470 + ... + 7670473.

It is an arithmetic number, because the mean of its divisors is an integer number (11505708).

Almost surely, 2^30681886 is an apocalyptic number.

30681886 is a deficient number, since it is larger than the sum of its proper divisors (15340946).

30681886 is a wasteful number, since it uses less digits than its factorization.

30681886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15340945.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 30681886 is about 5539.1232158167. The cubic root of 30681886 is about 313.0598340225.

The spelling of 30681886 in words is "thirty million, six hundred eighty-one thousand, eight hundred eighty-six".