321608260 has 72 divisors (see below), whose sum is σ = 723182040. Its totient is φ = 119992320.

The previous prime is 321608257. The next prime is 321608267. The reversal of 321608260 is 62806123.

It can be written as a sum of positive squares in 4 ways, for example, as 128731716 + 192876544 = 11346^2 + 13888^2 .

It is not an unprimeable number, because it can be changed into a prime (321608267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 557092 + ... + 557668.

It is an arithmetic number, because the mean of its divisors is an integer number (10044195).

Almost surely, 2^321608260 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321608260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (361591020).

321608260 is an abundant number, since it is smaller than the sum of its proper divisors (401573780).

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

321608260 is a wasteful number, since it uses less digits than its factorization.

321608260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 321608260 is about 17933.4397146783. The cubic root of 321608260 is about 685.1343335032.

The spelling of 321608260 in words is "three hundred twenty-one million, six hundred eight thousand, two hundred sixty".