684465220 has 48 divisors (see below), whose sum is σ = 1563090480. Its totient is φ = 250712064.

The previous prime is 684465191. The next prime is 684465241. The reversal of 684465220 is 22564486.

It can be written as a sum of positive squares in 8 ways, for example, as 9193024 + 675272196 = 3032^2 + 25986^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 684465220.

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 15 ways as a sum of consecutive naturals, for example, 14625 + ... + 39784.

It is an arithmetic number, because the mean of its divisors is an integer number (32564385).

Almost surely, 2^684465220 is an apocalyptic number.

It is an amenable number.

684465220 is an abundant number, since it is smaller than the sum of its proper divisors (878625260).

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

684465220 is a wasteful number, since it uses less digits than its factorization.

684465220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54472 (or 54470 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

The square root of 684465220 is about 26162.2862150845. The cubic root of 684465220 is about 881.2865221689.

The spelling of 684465220 in words is "six hundred eighty-four million, four hundred sixty-five thousand, two hundred twenty".