683787728 has 20 divisors (see below), whose sum is σ = 1426749828. Its totient is φ = 315594240.

The previous prime is 683787721. The next prime is 683787733. The reversal of 683787728 is 827787386.

It can be written as a sum of positive squares in 2 ways, for example, as 84125584 + 599662144 = 9172^2 + 24488^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (683787721) 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, 1643513 + ... + 1643928.

Almost surely, 2^683787728 is an apocalyptic number.

It is an amenable number.

683787728 is an abundant number, since it is smaller than the sum of its proper divisors (742962100).

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

683787728 is a wasteful number, since it uses less digits than its factorization.

683787728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287462 (or 3287456 counting only the distinct ones).

The product of its digits is 6322176, while the sum is 56.

The square root of 683787728 is about 26149.3351349513. The cubic root of 683787728 is about 880.9956568075.

The spelling of 683787728 in words is "six hundred eighty-three million, seven hundred eighty-seven thousand, seven hundred twenty-eight".