326644531200 has 960 divisors, whose sum is σ = 1310634864000. Its totient is φ = 79272345600.

The previous prime is 326644531193. The next prime is 326644531229. The reversal of 326644531200 is 2135446623.

326644531200 is a `hidden beast` number, since 3 + 2 + 6 + 6 + 445 + 3 + 1 + 200 = 666.

It is a tau number, because it is divible by the number of its divisors (960).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4600627165 + ... + 4600627235.

It is an arithmetic number, because the mean of its divisors is an integer number (1365244650).

Almost surely, 2^326644531200 is an apocalyptic number.

326644531200 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 326644531200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (655317432000).

326644531200 is an abundant number, since it is smaller than the sum of its proper divisors (983990332800).

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

326644531200 is an frugal number, since it uses more digits than its factorization.

326644531200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 326644531200 its reverse (2135446623), we get a palindrome (328779977823).

The spelling of 326644531200 in words is "three hundred twenty-six billion, six hundred forty-four million, five hundred thirty-one thousand, two hundred".