305128340 has 24 divisors (see below), whose sum is σ = 699021792. Its totient is φ = 110955680.

The previous prime is 305128337. The next prime is 305128349. The reversal of 305128340 is 43821503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305128349) 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, 693254 + ... + 693693.

It is an arithmetic number, because the mean of its divisors is an integer number (29125908).

Almost surely, 2^305128340 is an apocalyptic number.

It is an amenable number.

305128340 is an abundant number, since it is smaller than the sum of its proper divisors (393893452).

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

305128340 is a wasteful number, since it uses less digits than its factorization.

305128340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386967 (or 1386965 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 305128340 is about 17467.9231736346. The cubic root of 305128340 is about 673.2259514628.

Adding to 305128340 its reverse (43821503), we get a palindrome (348949843).

The spelling of 305128340 in words is "three hundred five million, one hundred twenty-eight thousand, three hundred forty".