307240728 has 64 divisors (see below), whose sum is σ = 815184000. Its totient is φ = 96164352.

The previous prime is 307240709. The next prime is 307240729. The reversal of 307240728 is 827042703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (307240729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301003 + ... + 302021.

It is an arithmetic number, because the mean of its divisors is an integer number (12737250).

Almost surely, 2^307240728 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 307240728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (407592000).

307240728 is an abundant number, since it is smaller than the sum of its proper divisors (507943272).

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

307240728 is a wasteful number, since it uses less digits than its factorization.

307240728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784 (or 1780 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 307240728 is about 17528.2836581338. The cubic root of 307240728 is about 674.7759497827.

The spelling of 307240728 in words is "three hundred seven million, two hundred forty thousand, seven hundred twenty-eight".