309728848 has 80 divisors (see below), whose sum is σ = 746577216. Its totient is φ = 122296320.

The previous prime is 309728803. The next prime is 309728863. The reversal of 309728848 is 848827903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34915 + ... + 42877.

Almost surely, 2^309728848 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 309728848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (373288608).

309728848 is an abundant number, since it is smaller than the sum of its proper divisors (436848368).

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

309728848 is a wasteful number, since it uses less digits than its factorization.

309728848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8012 (or 8006 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 309728848 is about 17599.1149777482. The cubic root of 309728848 is about 676.5925619005.

The spelling of 309728848 in words is "three hundred nine million, seven hundred twenty-eight thousand, eight hundred forty-eight".