684220699208 has 36 divisors (see below), whose sum is σ = 1362897701865. Its totient is φ = 321967494528.

The previous prime is 684220699181. The next prime is 684220699213. The reversal of 684220699208 is 802996022486.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 626215830244 + 58004868964 = 791338^2 + 240842^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=584902.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 39764735 + ... + 39781937.

Almost surely, 2^684220699208 is an apocalyptic number.

684220699208 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

684220699208 is a deficient number, since it is larger than the sum of its proper divisors (678677002657).

684220699208 is an frugal number, since it uses more digits than its factorization.

684220699208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34446 (or 17222 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 56.

The spelling of 684220699208 in words is "six hundred eighty-four billion, two hundred twenty million, six hundred ninety-nine thousand, two hundred eight".