7971891962 has 8 divisors (see below), whose sum is σ = 12023903892. Its totient is φ = 3963924000.

The previous prime is 7971891919. The next prime is 7971891979. The reversal of 7971891962 is 2691981797.

It can be written as a sum of positive squares in 2 ways, for example, as 4726425001 + 3245466961 = 68749^2 + 56969^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×7971891962² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11010539 + ... + 11011262.

Almost surely, 2^7971891962 is an apocalyptic number.

7971891962 is a deficient number, since it is larger than the sum of its proper divisors (4052011930).

7971891962 is a wasteful number, since it uses less digits than its factorization.

7971891962 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22021984.

The product of its digits is 3429216, while the sum is 59.

The square root of 7971891962 is about 89285.4521296723. The cubic root of 7971891962 is about 1997.6549148626.

The spelling of 7971891962 in words is "seven billion, nine hundred seventy-one million, eight hundred ninety-one thousand, nine hundred sixty-two".