321878816272 has 80 divisors (see below), whose sum is σ = 712548144000. Its totient is φ = 139539695616.

The previous prime is 321878816249. The next prime is 321878816293. The reversal of 321878816272 is 272618878123.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1673253 + ... + 1855675.

It is an arithmetic number, because the mean of its divisors is an integer number (8906851800).

Almost surely, 2^321878816272 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 321878816272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356274072000).

321878816272 is an abundant number, since it is smaller than the sum of its proper divisors (390669327728).

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

321878816272 is a wasteful number, since it uses less digits than its factorization.

321878816272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182960 (or 182954 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 55.

The spelling of 321878816272 in words is "three hundred twenty-one billion, eight hundred seventy-eight million, eight hundred sixteen thousand, two hundred seventy-two".