30905272 has 16 divisors (see below), whose sum is σ = 58102200. Its totient is φ = 15411360.

The previous prime is 30905257. The next prime is 30905279. The reversal of 30905272 is 27250903.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 30905272.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30905279) 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, 1854 + ... + 8077.

Almost surely, 2^30905272 is an apocalyptic number.

It is an amenable number.

30905272 is a deficient number, since it is larger than the sum of its proper divisors (27196928).

30905272 is a wasteful number, since it uses less digits than its factorization.

30905272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10326 (or 10322 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 30905272 is about 5559.2510286908. The cubic root of 30905272 is about 313.8177638113.

The spelling of 30905272 in words is "thirty million, nine hundred five thousand, two hundred seventy-two".