128015380172 has 24 divisors (see below), whose sum is σ = 239337483840. Its totient is φ = 59733804240.

The previous prime is 128015380151. The next prime is 128015380187. The reversal of 128015380172 is 271083510821.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12565154 + ... + 12575337.

It is an arithmetic number, because the mean of its divisors is an integer number (9972395160).

Almost surely, 2^128015380172 is an apocalyptic number.

It is an amenable number.

128015380172 is a deficient number, since it is larger than the sum of its proper divisors (111322103668).

128015380172 is a wasteful number, since it uses less digits than its factorization.

128015380172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25140581 (or 25140579 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 38.

Adding to 128015380172 its reverse (271083510821), we get a palindrome (399098890993).

The spelling of 128015380172 in words is "one hundred twenty-eight billion, fifteen million, three hundred eighty thousand, one hundred seventy-two".