684216020 has 18 divisors (see below), whose sum is σ = 1437099342. Its totient is φ = 273639616.

The previous prime is 684215953. The next prime is 684216031. The reversal of 684216020 is 20612486.

It can be written as a sum of positive squares in 3 ways, for example, as 16613776 + 667602244 = 4076^2 + 25838^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 114056 + ... + 119904.

Almost surely, 2^684216020 is an apocalyptic number.

It is an amenable number.

684216020 is an abundant number, since it is smaller than the sum of its proper divisors (752883322).

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

684216020 is an frugal number, since it uses more digits than its factorization.

684216020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11707 (or 5856 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 684216020 is about 26157.5232007925. The cubic root of 684216020 is about 881.1795562960.

The spelling of 684216020 in words is "six hundred eighty-four million, two hundred sixteen thousand, twenty".