684558066 has 8 divisors (see below), whose sum is σ = 1369116144. Its totient is φ = 228186020.

The previous prime is 684558029. The next prime is 684558071. The reversal of 684558066 is 660855486.

It is a happy number.

684558066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

684558066 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57046500 + ... + 57046511.

It is an arithmetic number, because the mean of its divisors is an integer number (171139518).

Almost surely, 2^684558066 is an apocalyptic number.

684558066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

684558066 is a wasteful number, since it uses less digits than its factorization.

684558066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114093016.

The product of its (nonzero) digits is 1382400, while the sum is 48.

The square root of 684558066 is about 26164.0605793520. The cubic root of 684558066 is about 881.3263684736.

The spelling of 684558066 in words is "six hundred eighty-four million, five hundred fifty-eight thousand, sixty-six".