684650 has 12 divisors (see below), whose sum is σ = 1273542. Its totient is φ = 273840.

The previous prime is 684647. The next prime is 684683. The reversal of 684650 is 56486.

684650 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 3 ways, for example, as 667489 + 17161 = 817^2 + 131^2 .

It is a super-3 number, since 3×684650³ = 962780071333875000, which contains 333 as substring.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

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, 6797 + ... + 6896.

2⁶⁸⁴⁶⁵⁰ is an apocalyptic number.

684650 is a deficient number, since it is larger than the sum of its proper divisors (588892).

684650 is a wasteful number, since it uses less digits than its factorization.

684650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13705 (or 13700 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 684650 is about 827.4357981137. The cubic root of 684650 is about 88.1365819829.

The spelling of 684650 in words is "six hundred eighty-four thousand, six hundred fifty".