684704 has 12 divisors (see below), whose sum is σ = 1348074. Its totient is φ = 342336.

The previous prime is 684683. The next prime is 684713. The reversal of 684704 is 407486.

It can be written as a sum of positive squares in only one way, i.e., 384400 + 300304 = 620^2 + 548^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667 + ... + 10730.

2⁶⁸⁴⁷⁰⁴ is an apocalyptic number.

It is an amenable number.

684704 is a deficient number, since it is larger than the sum of its proper divisors (663370).

684704 is a wasteful number, since it uses less digits than its factorization.

684704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21407 (or 21399 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 684704 is about 827.4684284007. The cubic root of 684704 is about 88.1388991038.

The spelling of 684704 in words is "six hundred eighty-four thousand, seven hundred four".