321088729416 has 256 divisors, whose sum is σ = 1018681090560. Its totient is φ = 82068111360.

The previous prime is 321088729399. The next prime is 321088729421. The reversal of 321088729416 is 614927880123.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20759926 + ... + 20775386.

It is an arithmetic number, because the mean of its divisors is an integer number (3979223010).

Almost surely, 2^321088729416 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 321088729416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (509340545280).

321088729416 is an abundant number, since it is smaller than the sum of its proper divisors (697592361144).

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

321088729416 is a wasteful number, since it uses less digits than its factorization.

321088729416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15784 (or 15780 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 321088729416 in words is "three hundred twenty-one billion, eighty-eight million, seven hundred twenty-nine thousand, four hundred sixteen".