684821322 has 24 divisors (see below), whose sum is σ = 1504108164. Its totient is φ = 225146304.

The previous prime is 684821317. The next prime is 684821323. The reversal of 684821322 is 223128486.

It can be written as a sum of positive squares in 2 ways, for example, as 684816561 + 4761 = 26169^2 + 69^2 .

It is not an unprimeable number, because it can be changed into a prime (684821323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 259273 + ... + 261900.

Almost surely, 2^684821322 is an apocalyptic number.

684821322 is an abundant number, since it is smaller than the sum of its proper divisors (819286842).

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

684821322 is a wasteful number, since it uses less digits than its factorization.

684821322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521254 (or 521251 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 684821322 is about 26169.0909662525. The cubic root of 684821322 is about 881.4393292926.

The spelling of 684821322 in words is "six hundred eighty-four million, eight hundred twenty-one thousand, three hundred twenty-two".