30305072 has 80 divisors (see below), whose sum is σ = 70566912. Its totient is φ = 12337920.

The previous prime is 30305069. The next prime is 30305129. The reversal of 30305072 is 27050303.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294173 + ... + 294275.

Almost surely, 2^30305072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30305072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35283456).

30305072 is an abundant number, since it is smaller than the sum of its proper divisors (40261840).

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

30305072 is a wasteful number, since it uses less digits than its factorization.

30305072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 20.

The square root of 30305072 is about 5505.0042688448. The cubic root of 30305072 is about 311.7729555723.

Adding to 30305072 its reverse (27050303), we get a palindrome (57355375).

The spelling of 30305072 in words is "thirty million, three hundred five thousand, seventy-two".