684740 has 48 divisors (see below), whose sum is σ = 1690752. Its totient is φ = 228096.

The previous prime is 684731. The next prime is 684751. The reversal of 684740 is 47486.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9344 + ... + 9416.

It is an arithmetic number, because the mean of its divisors is an integer number (35224).

2⁶⁸⁴⁷⁴⁰ 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 684740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (845376).

684740 is an abundant number, since it is smaller than the sum of its proper divisors (1006012).

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

684740 is a wasteful number, since it uses less digits than its factorization.

684740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 154 counting only the distinct ones).

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

The square root of 684740 is about 827.4901812106. The cubic root of 684740 is about 88.1404437833.

The spelling of 684740 in words is "six hundred eighty-four thousand, seven hundred forty".