684469819 has 8 divisors (see below), whose sum is σ = 747494208. Its totient is φ = 621578760.

The previous prime is 684469787. The next prime is 684469823. The reversal of 684469819 is 918964486.

684469819 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.

It is not a de Polignac number, because 684469819 - 2⁵ = 684469787 is a prime.

It is a super-2 number, since 2×684469819² = 936997866243785522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 684469819.

It is not an unprimeable number, because it can be changed into a prime (684419819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22437 + ... + 43270.

It is an arithmetic number, because the mean of its divisors is an integer number (93436776).

Almost surely, 2^684469819 is an apocalyptic number.

684469819 is a deficient number, since it is larger than the sum of its proper divisors (63024389).

684469819 is a wasteful number, since it uses less digits than its factorization.

684469819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66665.

The product of its digits is 2985984, while the sum is 55.

The square root of 684469819 is about 26162.3741086317. The cubic root of 684469819 is about 881.2884959861.

The spelling of 684469819 in words is "six hundred eighty-four million, four hundred sixty-nine thousand, eight hundred nineteen".