12328321640 has 16 divisors (see below), whose sum is σ = 27738723780. Its totient is φ = 4931328640.

The previous prime is 12328321601. The next prime is 12328321657. The reversal of 12328321640 is 4612382321.

12328321640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11937310564 + 391011076 = 109258^2 + 19774^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12328321597 and 12328321606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154103981 + ... + 154104060.

Almost surely, 2^12328321640 is an apocalyptic number.

12328321640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12328321640 is an abundant number, since it is smaller than the sum of its proper divisors (15410402140).

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

12328321640 is a wasteful number, since it uses less digits than its factorization.

12328321640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308208052 (or 308208048 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 12328321640 in words is "twelve billion, three hundred twenty-eight million, three hundred twenty-one thousand, six hundred forty".