128320012 has 24 divisors (see below), whose sum is σ = 245972160. Its totient is φ = 58302720.

The previous prime is 128320001. The next prime is 128320019. The reversal of 128320012 is 210023821.

It is not an unprimeable number, because it can be changed into a prime (128320019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30564 + ... + 34507.

It is an arithmetic number, because the mean of its divisors is an integer number (10248840).

Almost surely, 2^128320012 is an apocalyptic number.

It is an amenable number.

128320012 is a deficient number, since it is larger than the sum of its proper divisors (117652148).

128320012 is a wasteful number, since it uses less digits than its factorization.

128320012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65121 (or 65119 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 128320012 is about 11327.8423364734. The cubic root of 128320012 is about 504.3880598713.

Adding to 128320012 its reverse (210023821), we get a palindrome (338343833).

The spelling of 128320012 in words is "one hundred twenty-eight million, three hundred twenty thousand, twelve".