30656813 has 8 divisors (see below), whose sum is σ = 34011360. Its totient is φ = 27396880.

The previous prime is 30656789. The next prime is 30656827. The reversal of 30656813 is 31865603.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30656813 - 2⁶ = 30656749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30656813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30656113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22970 + ... + 24267.

It is an arithmetic number, because the mean of its divisors is an integer number (4251420).

Almost surely, 2^30656813 is an apocalyptic number.

It is an amenable number.

30656813 is a deficient number, since it is larger than the sum of its proper divisors (3354547).

30656813 is a wasteful number, since it uses less digits than its factorization.

30656813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47307.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 30656813 is about 5536.8594889161. The cubic root of 30656813 is about 312.9745340909.

The spelling of 30656813 in words is "thirty million, six hundred fifty-six thousand, eight hundred thirteen".