9128129972 has 12 divisors (see below), whose sum is σ = 17203014276. Its totient is φ = 4212983040.

The previous prime is 9128129909. The next prime is 9128130007. The reversal of 9128129972 is 2799218219.

It can be written as a sum of positive squares in 2 ways, for example, as 4821358096 + 4306771876 = 69436^2 + 65626^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 9128129972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87770429 + ... + 87770532.

It is an arithmetic number, because the mean of its divisors is an integer number (1433584523).

Almost surely, 2^9128129972 is an apocalyptic number.

It is an amenable number.

9128129972 is a deficient number, since it is larger than the sum of its proper divisors (8074884304).

9128129972 is a wasteful number, since it uses less digits than its factorization.

9128129972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175540978 (or 175540976 counting only the distinct ones).

The product of its digits is 326592, while the sum is 50.

The square root of 9128129972 is about 95541.2474902856. The cubic root of 9128129972 is about 2089.9084971730.

The spelling of 9128129972 in words is "nine billion, one hundred twenty-eight million, one hundred twenty-nine thousand, nine hundred seventy-two".