684632321 has 8 divisors (see below), whose sum is σ = 687560160. Its totient is φ = 681711552.

The previous prime is 684632287. The next prime is 684632363. The reversal of 684632321 is 123236486.

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

It is a cyclic number.

It is not a de Polignac number, because 684632321 - 2⁶ = 684632257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684632821) 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, 277190 + ... + 279648.

It is an arithmetic number, because the mean of its divisors is an integer number (85945020).

Almost surely, 2^684632321 is an apocalyptic number.

It is an amenable number.

684632321 is a deficient number, since it is larger than the sum of its proper divisors (2927839).

684632321 is a wasteful number, since it uses less digits than its factorization.

684632321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535.

The product of its digits is 41472, while the sum is 35.

The square root of 684632321 is about 26165.4795675524. The cubic root of 684632321 is about 881.3582335686.

The spelling of 684632321 in words is "six hundred eighty-four million, six hundred thirty-two thousand, three hundred twenty-one".