4991432128 has 28 divisors (see below), whose sum is σ = 9914704072. Its totient is φ = 2493239040.

The previous prime is 4991432093. The next prime is 4991432167. The reversal of 4991432128 is 8212341994.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 27151 + ... + 103537.

It is an arithmetic number, because the mean of its divisors is an integer number (354096574).

Almost surely, 2^4991432128 is an apocalyptic number.

It is an amenable number.

4991432128 is a deficient number, since it is larger than the sum of its proper divisors (4923271944).

4991432128 is a wasteful number, since it uses less digits than its factorization.

4991432128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77420 (or 77410 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 4991432128 is about 70650.0681386791. The cubic root of 4991432128 is about 1708.9986645798.

The spelling of 4991432128 in words is "four billion, nine hundred ninety-one million, four hundred thirty-two thousand, one hundred twenty-eight".