305730012 has 72 divisors (see below), whose sum is σ = 832371456. Its totient is φ = 87085152.

The previous prime is 305730011. The next prime is 305730037. The reversal of 305730012 is 210037503.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305730011) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 271683 + ... + 272805.

Almost surely, 2^305730012 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 305730012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (416185728).

305730012 is an abundant number, since it is smaller than the sum of its proper divisors (526641444).

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

305730012 is a wasteful number, since it uses less digits than its factorization.

305730012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607 (or 1598 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 305730012 is about 17485.1368882260. The cubic root of 305730012 is about 673.6681645699.

Adding to 305730012 its reverse (210037503), we get a palindrome (515767515).

The spelling of 305730012 in words is "three hundred five million, seven hundred thirty thousand, twelve".