3128878811 has 4 divisors (see below), whose sum is σ = 3129036432. Its totient is φ = 3128721192.

The previous prime is 3128878799. The next prime is 3128878861. The reversal of 3128878811 is 1188788213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1188788213 = 29 ⋅40992697.

It is a cyclic number.

It is not a de Polignac number, because 3128878811 - 2²⁶ = 3061769947 is a prime.

It is a super-2 number, since 2×3128878811² = 19579765227849547442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3128878861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43871 + ... + 90456.

It is an arithmetic number, because the mean of its divisors is an integer number (782259108).

Almost surely, 2^3128878811 is an apocalyptic number.

3128878811 is a deficient number, since it is larger than the sum of its proper divisors (157621).

3128878811 is a wasteful number, since it uses less digits than its factorization.

3128878811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157620.

The product of its digits is 172032, while the sum is 47.

The square root of 3128878811 is about 55936.3818189915. The cubic root of 3128878811 is about 1462.6135103268.

The spelling of 3128878811 in words is "three billion, one hundred twenty-eight million, eight hundred seventy-eight thousand, eight hundred eleven".