3128721922 has 16 divisors (see below), whose sum is σ = 4970298240. Its totient is φ = 1471998528.

The previous prime is 3128721881. The next prime is 3128721941. The reversal of 3128721922 is 2291278213.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196579 + ... + 211897.

It is an arithmetic number, because the mean of its divisors is an integer number (310643640).

Almost surely, 2^3128721922 is an apocalyptic number.

3128721922 is a deficient number, since it is larger than the sum of its proper divisors (1841576318).

3128721922 is a wasteful number, since it uses less digits than its factorization.

3128721922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21345.

The product of its digits is 24192, while the sum is 37.

The square root of 3128721922 is about 55934.9794136013. The cubic root of 3128721922 is about 1462.5890636778.

The spelling of 3128721922 in words is "three billion, one hundred twenty-eight million, seven hundred twenty-one thousand, nine hundred twenty-two".