30681656 has 32 divisors (see below), whose sum is σ = 61430400. Its totient is φ = 14323680.

The previous prime is 30681631. The next prime is 30681683. The reversal of 30681656 is 65618603.

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, 9371 + ... + 12213.

It is an arithmetic number, because the mean of its divisors is an integer number (1919700).

Almost surely, 2^30681656 is an apocalyptic number.

It is an amenable number.

30681656 is an abundant number, since it is smaller than the sum of its proper divisors (30748744).

30681656 is a wasteful number, since it uses less digits than its factorization.

30681656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2939 (or 2935 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 30681656 is about 5539.1024543693. The cubic root of 30681656 is about 313.0590517592.

The spelling of 30681656 in words is "thirty million, six hundred eighty-one thousand, six hundred fifty-six".