3891118028 has 18 divisors (see below), whose sum is σ = 7921204956. Its totient is φ = 1667621928.

The previous prime is 3891118019. The next prime is 3891118073. The reversal of 3891118028 is 8208111983.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9926126 + ... + 9926517.

It is an arithmetic number, because the mean of its divisors is an integer number (440066942).

Almost surely, 2^3891118028 is an apocalyptic number.

It is an amenable number.

3891118028 is an abundant number, since it is smaller than the sum of its proper divisors (4030086928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3891118028 is a wasteful number, since it uses less digits than its factorization.

3891118028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19852661 (or 19852652 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 3891118028 is about 62378.8267603680. The cubic root of 3891118028 is about 1572.8650711754.

The spelling of 3891118028 in words is "three billion, eight hundred ninety-one million, one hundred eighteen thousand, twenty-eight".