684036 has 18 divisors (see below), whose sum is σ = 1729182. Its totient is φ = 228000.

The previous prime is 684017. The next prime is 684037. The reversal of 684036 is 630486.

It can be written as a sum of positive squares in only one way, i.e., 476100 + 207936 = 690^2 + 456^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (684037) by changing a digit.

684036 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9465 + ... + 9536.

2⁶⁸⁴⁰³⁶ is an apocalyptic number.

It is an amenable number.

684036 is an abundant number, since it is smaller than the sum of its proper divisors (1045146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684036 is a wasteful number, since it uses less digits than its factorization.

684036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19011 (or 19006 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 684036 is about 827.0646891266. The cubic root of 684036 is about 88.1102268883.

The spelling of 684036 in words is "six hundred eighty-four thousand, thirty-six".