30813188 has 12 divisors (see below), whose sum is σ = 61626432. Its totient is φ = 13205640.

The previous prime is 30813187. The next prime is 30813191. The reversal of 30813188 is 88131803.

30813188 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (30813187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550208 + ... + 550263.

It is an arithmetic number, because the mean of its divisors is an integer number (5135536).

Almost surely, 2^30813188 is an apocalyptic number.

It is an amenable number.

30813188 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

30813188 is a wasteful number, since it uses less digits than its factorization.

30813188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100482 (or 1100480 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 30813188 is about 5550.9627993709. The cubic root of 30813188 is about 313.5057745037.

The spelling of 30813188 in words is "thirty million, eight hundred thirteen thousand, one hundred eighty-eight".