3128231865 has 16 divisors (see below), whose sum is σ = 5460186816. Its totient is φ = 1516718400.

The previous prime is 3128231857. The next prime is 3128231867. The reversal of 3128231865 is 5681328213.

It is not a de Polignac number, because 3128231865 - 2³ = 3128231857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3128231867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9479326 + ... + 9479655.

It is an arithmetic number, because the mean of its divisors is an integer number (341261676).

Almost surely, 2^3128231865 is an apocalyptic number.

It is an amenable number.

3128231865 is a deficient number, since it is larger than the sum of its proper divisors (2331954951).

3128231865 is a wasteful number, since it uses less digits than its factorization.

3128231865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18959000.

The product of its digits is 69120, while the sum is 39.

The square root of 3128231865 is about 55930.5986468945. The cubic root of 3128231865 is about 1462.5126970919.

The spelling of 3128231865 in words is "three billion, one hundred twenty-eight million, two hundred thirty-one thousand, eight hundred sixty-five".