684523224 has 384 divisors, whose sum is σ = 2547417600. Its totient is φ = 166717440.

The previous prime is 684523223. The next prime is 684523243. The reversal of 684523224 is 422325486.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684523223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2544562 + ... + 2544830.

It is an arithmetic number, because the mean of its divisors is an integer number (6633900).

Almost surely, 2^684523224 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 684523224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273708800).

684523224 is an abundant number, since it is smaller than the sum of its proper divisors (1862894376).

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

684523224 is a wasteful number, since it uses less digits than its factorization.

684523224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 309 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

The square root of 684523224 is about 26163.3947338643. The cubic root of 684523224 is about 881.3114159098.

The spelling of 684523224 in words is "six hundred eighty-four million, five hundred twenty-three thousand, two hundred twenty-four".