1684713728 has 18 divisors (see below), whose sum is σ = 3362847054. Its totient is φ = 842356736.

The previous prime is 1684713713. The next prime is 1684713761. The reversal of 1684713728 is 8273174861.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1440354304 + 244359424 = 37952^2 + 15632^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3290201 + ... + 3290712.

Almost surely, 2^1684713728 is an apocalyptic number.

It is an amenable number.

1684713728 is a deficient number, since it is larger than the sum of its proper divisors (1678133326).

1684713728 is an frugal number, since it uses more digits than its factorization.

1684713728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6580929 (or 6580915 counting only the distinct ones).

The product of its digits is 451584, while the sum is 47.

The square root of 1684713728 is about 41045.2643797065. The cubic root of 1684713728 is about 1189.8951789600.

The spelling of 1684713728 in words is "one billion, six hundred eighty-four million, seven hundred thirteen thousand, seven hundred twenty-eight".