684278356 has 24 divisors (see below), whose sum is σ = 1298857896. Its totient is φ = 314158080.

The previous prime is 684278351. The next prime is 684278381. The reversal of 684278356 is 653872486.

It can be written as a sum of positive squares in 4 ways, for example, as 167443600 + 516834756 = 12940^2 + 22734^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684278351) 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 7 ways as a sum of consecutive naturals, for example, 119931 + ... + 125506.

It is an arithmetic number, because the mean of its divisors is an integer number (54119079).

Almost surely, 2^684278356 is an apocalyptic number.

It is an amenable number.

684278356 is a deficient number, since it is larger than the sum of its proper divisors (614579540).

684278356 is a wasteful number, since it uses less digits than its factorization.

684278356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245499 (or 245497 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 49.

The square root of 684278356 is about 26158.7147237780. The cubic root of 684278356 is about 881.2063156522.

The spelling of 684278356 in words is "six hundred eighty-four million, two hundred seventy-eight thousand, three hundred fifty-six".