684616 has 8 divisors (see below), whose sum is σ = 1283670. Its totient is φ = 342304.

The previous prime is 684599. The next prime is 684617. The reversal of 684616 is 616486.

It can be written as a sum of positive squares in only one way, i.e., 624100 + 60516 = 790^2 + 246^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (684617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42781 + ... + 42796.

2⁶⁸⁴⁶¹⁶ is an apocalyptic number.

It is an amenable number.

684616 is a deficient number, since it is larger than the sum of its proper divisors (599054).

684616 is a wasteful number, since it uses less digits than its factorization.

684616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85583 (or 85579 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 684616 is about 827.4152524579. The cubic root of 684616 is about 88.1351229925.

The spelling of 684616 in words is "six hundred eighty-four thousand, six hundred sixteen".