684736 has 28 divisors (see below), whose sum is σ = 1465072. Its totient is φ = 315648.

The previous prime is 684731. The next prime is 684751. The reversal of 684736 is 637486.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684731) by changing a digit.

684736 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 3 ways as a sum of consecutive naturals, for example, 421 + ... + 1243.

It is an arithmetic number, because the mean of its divisors is an integer number (52324).

2⁶⁸⁴⁷³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732536).

684736 is an abundant number, since it is smaller than the sum of its proper divisors (780336).

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

684736 is a wasteful number, since it uses less digits than its factorization.

684736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848 (or 838 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 684736 is about 827.4877642600. The cubic root of 684736 is about 88.1402721549.

The spelling of 684736 in words is "six hundred eighty-four thousand, seven hundred thirty-six".