684066724 has 18 divisors (see below), whose sum is σ = 1315840022. Its totient is φ = 310939200.

The previous prime is 684066701. The next prime is 684066743. The reversal of 684066724 is 427660486.

It can be written as a sum of positive squares in only one way, i.e., 354644224 + 329422500 = 18832^2 + 18150^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 706197 + ... + 707164.

Almost surely, 2^684066724 is an apocalyptic number.

It is an amenable number.

684066724 is a deficient number, since it is larger than the sum of its proper divisors (631773298).

684066724 is a wasteful number, since it uses less digits than its factorization.

684066724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413387 (or 1413374 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 43.

The square root of 684066724 is about 26154.6692580885. The cubic root of 684066724 is about 881.1154604798.

The spelling of 684066724 in words is "six hundred eighty-four million, sixty-six thousand, seven hundred twenty-four".