684475728 has 40 divisors (see below), whose sum is σ = 1816023648. Its totient is φ = 221991552.

The previous prime is 684475721. The next prime is 684475751. The reversal of 684475728 is 827574486.

It is a super-2 number, since 2×684475728² = 937014044442259968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684475721) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 190926 + ... + 194477.

Almost surely, 2^684475728 is an apocalyptic number.

It is an amenable number.

684475728 is an abundant number, since it is smaller than the sum of its proper divisors (1131547920).

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

684475728 is a wasteful number, since it uses less digits than its factorization.

684475728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385451 (or 385445 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 51.

The square root of 684475728 is about 26162.4870377417. The cubic root of 684475728 is about 881.2910320214.

The spelling of 684475728 in words is "six hundred eighty-four million, four hundred seventy-five thousand, seven hundred twenty-eight".