321478689 has 16 divisors (see below), whose sum is σ = 515655680. Its totient is φ = 174033360.

The previous prime is 321478679. The next prime is 321478693. The reversal of 321478689 is 986874123.

It is not a de Polignac number, because 321478689 - 2¹³ = 321470497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321478609) 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, 402457 + ... + 403254.

It is an arithmetic number, because the mean of its divisors is an integer number (32228480).

Almost surely, 2^321478689 is an apocalyptic number.

It is an amenable number.

321478689 is a deficient number, since it is larger than the sum of its proper divisors (194176991).

321478689 is a wasteful number, since it uses less digits than its factorization.

321478689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805740.

The product of its digits is 580608, while the sum is 48.

The square root of 321478689 is about 17929.8267978249. The cubic root of 321478689 is about 685.0423111308.

The spelling of 321478689 in words is "three hundred twenty-one million, four hundred seventy-eight thousand, six hundred eighty-nine".