684673988 has 6 divisors (see below), whose sum is σ = 1198179486. Its totient is φ = 342336992.

The previous prime is 684673939. The next prime is 684673999. The reversal of 684673988 is 889376486.

684673988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 564157504 + 120516484 = 23752^2 + 10978^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85584245 + ... + 85584252.

It is an arithmetic number, because the mean of its divisors is an integer number (199696581).

Almost surely, 2^684673988 is an apocalyptic number.

It is an amenable number.

684673988 is a deficient number, since it is larger than the sum of its proper divisors (513505498).

684673988 is a wasteful number, since it uses less digits than its factorization.

684673988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171168501 (or 171168499 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 59.

The square root of 684673988 is about 26166.2757762736. The cubic root of 684673988 is about 881.3761131454.

The spelling of 684673988 in words is "six hundred eighty-four million, six hundred seventy-three thousand, nine hundred eighty-eight".