845021728 has 24 divisors (see below), whose sum is σ = 1674242892. Its totient is φ = 419817216.

The previous prime is 845021719. The next prime is 845021729. The reversal of 845021728 is 827120548.

It can be written as a sum of positive squares in 2 ways, for example, as 840304144 + 4717584 = 28988^2 + 2172^2 .

It is not an unprimeable number, because it can be changed into a prime (845021729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79075 + ... + 89122.

Almost surely, 2^845021728 is an apocalyptic number.

It is an amenable number.

845021728 is a deficient number, since it is larger than the sum of its proper divisors (829221164).

845021728 is a wasteful number, since it uses less digits than its factorization.

845021728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168364 (or 168356 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 845021728 is about 29069.2574380564. The cubic root of 845021728 is about 945.4152978060.

The spelling of 845021728 in words is "eight hundred forty-five million, twenty-one thousand, seven hundred twenty-eight".