326722387968 has 456 divisors, whose sum is σ = 1025958355968. Its totient is φ = 103705214976.

The previous prime is 326722387961. The next prime is 326722387993. The reversal of 326722387968 is 869783227623.

It is a happy number.

326722387968 is a `hidden beast` number, since 326 + 7 + 2 + 238 + 79 + 6 + 8 = 666.

It is a super-2 number, since 2×326722387968² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (326722387961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1465122705 + ... + 1465122927.

Almost surely, 2^326722387968 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 326722387968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (512979177984).

326722387968 is an abundant number, since it is smaller than the sum of its proper divisors (699235968000).

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

326722387968 is an frugal number, since it uses more digits than its factorization.

326722387968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 251 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 63.

The spelling of 326722387968 in words is "three hundred twenty-six billion, seven hundred twenty-two million, three hundred eighty-seven thousand, nine hundred sixty-eight".