684032180 has 48 divisors (see below), whose sum is σ = 1557435600. Its totient is φ = 250856448.

The previous prime is 684032177. The next prime is 684032189. The reversal of 684032180 is 81230486.

It can be written as a sum of positive squares in 8 ways, for example, as 284192164 + 399840016 = 16858^2 + 19996^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684032189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29912 + ... + 47568.

It is an arithmetic number, because the mean of its divisors is an integer number (32446575).

Almost surely, 2^684032180 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 684032180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (778717800).

684032180 is an abundant number, since it is smaller than the sum of its proper divisors (873403420).

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

684032180 is a wasteful number, since it uses less digits than its factorization.

684032180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17828 (or 17826 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 684032180 is about 26154.0088705346. The cubic root of 684032180 is about 881.1006287079.

The spelling of 684032180 in words is "six hundred eighty-four million, thirty-two thousand, one hundred eighty".