3128656979 has 4 divisors (see below), whose sum is σ = 3575607984. Its totient is φ = 2681705976.

The previous prime is 3128656963. The next prime is 3128657027. The reversal of 3128656979 is 9796568213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9796568213 = 29 ⋅337812697.

It is a cyclic number.

It is not a de Polignac number, because 3128656979 - 2⁴ = 3128656963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3128616979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223475492 + ... + 223475505.

It is an arithmetic number, because the mean of its divisors is an integer number (893901996).

Almost surely, 2^3128656979 is an apocalyptic number.

3128656979 is a deficient number, since it is larger than the sum of its proper divisors (446951005).

3128656979 is an equidigital number, since it uses as much as digits as its factorization.

3128656979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446951004.

The product of its digits is 4898880, while the sum is 56.

The square root of 3128656979 is about 55934.3988883406. The cubic root of 3128656979 is about 1462.5789439355.

The spelling of 3128656979 in words is "three billion, one hundred twenty-eight million, six hundred fifty-six thousand, nine hundred seventy-nine".