7991591444 has 24 divisors (see below), whose sum is σ = 14731701600. Its totient is φ = 3782829600.

The previous prime is 7991591441. The next prime is 7991591513. The reversal of 7991591444 is 4441951997.

It is a happy number.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991591441) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 74042 + ... + 146510.

It is an arithmetic number, because the mean of its divisors is an integer number (613820900).

Almost surely, 2^7991591444 is an apocalyptic number.

It is an amenable number.

7991591444 is a deficient number, since it is larger than the sum of its proper divisors (6740110156).

7991591444 is a wasteful number, since it uses less digits than its factorization.

7991591444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73943 (or 73941 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 53.

The square root of 7991591444 is about 89395.7014850267. The cubic root of 7991591444 is about 1999.2990413572.

The spelling of 7991591444 in words is "seven billion, nine hundred ninety-one million, five hundred ninety-one thousand, four hundred forty-four".