3128717978 has 16 divisors (see below), whose sum is σ = 4975193664. Its totient is φ = 1470544320.

The previous prime is 3128717971. The next prime is 3128717981. The reversal of 3128717978 is 8797178213.

It is not an unprimeable number, because it can be changed into a prime (3128717971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27518 + ... + 83753.

It is an arithmetic number, because the mean of its divisors is an integer number (310949604).

Almost surely, 2^3128717978 is an apocalyptic number.

3128717978 is a deficient number, since it is larger than the sum of its proper divisors (1846475686).

3128717978 is a wasteful number, since it uses less digits than its factorization.

3128717978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112117.

The product of its digits is 1185408, while the sum is 53.

The square root of 3128717978 is about 55934.9441583703. The cubic root of 3128717978 is about 1462.5884491080.

The spelling of 3128717978 in words is "three billion, one hundred twenty-eight million, seven hundred seventeen thousand, nine hundred seventy-eight".