684752728 has 32 divisors (see below), whose sum is σ = 1401941520. Its totient is φ = 310960000.

The previous prime is 684752701. The next prime is 684752753. The reversal of 684752728 is 827257486.

684752728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111498 + ... + 117478.

Almost surely, 2^684752728 is an apocalyptic number.

It is an amenable number.

684752728 is an abundant number, since it is smaller than the sum of its proper divisors (717188792).

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

684752728 is a wasteful number, since it uses less digits than its factorization.

684752728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7299 (or 7295 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 49.

The square root of 684752728 is about 26167.7803414810. The cubic root of 684752728 is about 881.4098990036.

The spelling of 684752728 in words is "six hundred eighty-four million, seven hundred fifty-two thousand, seven hundred twenty-eight".