321761960 has 128 divisors (see below), whose sum is σ = 849744000. Its totient is φ = 108573696.

The previous prime is 321761959. The next prime is 321762029. The reversal of 321761960 is 69167123.

It is a self number, because there is not a number n which added to its sum of digits gives 321761960.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 285959 + ... + 287081.

It is an arithmetic number, because the mean of its divisors is an integer number (6638625).

Almost surely, 2^321761960 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 321761960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (424872000).

321761960 is an abundant number, since it is smaller than the sum of its proper divisors (527982040).

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

321761960 is a wasteful number, since it uses less digits than its factorization.

321761960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195 (or 1191 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 321761960 is about 17937.7244933687. The cubic root of 321761960 is about 685.2434604433.

The spelling of 321761960 in words is "three hundred twenty-one million, seven hundred sixty-one thousand, nine hundred sixty".