684669321 has 16 divisors (see below), whose sum is σ = 1159228800. Its totient is φ = 391239504.

The previous prime is 684669311. The next prime is 684669329. The reversal of 684669321 is 123966486.

684669321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 684669321 - 2⁵ = 684669289 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (684669329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1811106 + ... + 1811483.

It is an arithmetic number, because the mean of its divisors is an integer number (72451800).

Almost surely, 2^684669321 is an apocalyptic number.

It is an amenable number.

684669321 is a deficient number, since it is larger than the sum of its proper divisors (474559479).

684669321 is a wasteful number, since it uses less digits than its factorization.

684669321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622605 (or 3622599 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 684669321 is about 26166.1865964454. The cubic root of 684669321 is about 881.3741105418.

It can be divided in two parts, 6846 and 69321, that added together give a palindrome (76167).

The spelling of 684669321 in words is "six hundred eighty-four million, six hundred sixty-nine thousand, three hundred twenty-one".