684739224 has 256 divisors, whose sum is σ = 2155507200. Its totient is φ = 200019456.

The previous prime is 684739219. The next prime is 684739241. The reversal of 684739224 is 422937486.

It is a self number, because there is not a number n which added to its sum of digits gives 684739224.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 6399379 + ... + 6399485.

It is an arithmetic number, because the mean of its divisors is an integer number (8419950).

Almost surely, 2^684739224 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 684739224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1077753600).

684739224 is an abundant number, since it is smaller than the sum of its proper divisors (1470767976).

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

684739224 is a wasteful number, since it uses less digits than its factorization.

684739224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 221 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 684739224 is about 26167.5223129741. The cubic root of 684739224 is about 881.4041048743.

The spelling of 684739224 in words is "six hundred eighty-four million, seven hundred thirty-nine thousand, two hundred twenty-four".