30681936 has 40 divisors (see below), whose sum is σ = 88069760. Its totient is φ = 10227168.

The previous prime is 30681907. The next prime is 30681961. The reversal of 30681936 is 63918603.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 30681936.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35080 + ... + 35943.

It is an arithmetic number, because the mean of its divisors is an integer number (2201744).

Almost surely, 2^30681936 is an apocalyptic number.

30681936 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

30681936 is an abundant number, since it is smaller than the sum of its proper divisors (57387824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30681936 is a wasteful number, since it uses less digits than its factorization.

30681936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71040 (or 71028 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 30681936 is about 5539.1277291646. The cubic root of 30681936 is about 313.0600040793.

The spelling of 30681936 in words is "thirty million, six hundred eighty-one thousand, nine hundred thirty-six".