684222664 has 24 divisors (see below), whose sum is σ = 1358989110. Its totient is φ = 321843584.

The previous prime is 684222659. The next prime is 684222673. The reversal of 684222664 is 466222486.

It can be written as a sum of positive squares in only one way, i.e., 503104900 + 181117764 = 22430^2 + 13458^2 .

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 5 ways as a sum of consecutive naturals, for example, 303927 + ... + 306169.

Almost surely, 2^684222664 is an apocalyptic number.

It is an amenable number.

684222664 is a deficient number, since it is larger than the sum of its proper divisors (674766446).

684222664 is an equidigital number, since it uses as much as digits as its factorization.

684222664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4509 (or 2262 counting only the distinct ones).

The product of its digits is 221184, while the sum is 40.

The square root of 684222664 is about 26157.6502002760. The cubic root of 684222664 is about 881.1824084839.

The spelling of 684222664 in words is "six hundred eighty-four million, two hundred twenty-two thousand, six hundred sixty-four".