8278271991 has 36 divisors (see below), whose sum is σ = 13239547776. Its totient is φ = 4980423360.

The previous prime is 8278271977. The next prime is 8278272001. The reversal of 8278271991 is 1991728728.

It is not a de Polignac number, because 8278271991 - 2⁷ = 8278271863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8278271951) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 121450 + ... + 176936.

It is an arithmetic number, because the mean of its divisors is an integer number (367765216).

Almost surely, 2^8278271991 is an apocalyptic number.

8278271991 is a deficient number, since it is larger than the sum of its proper divisors (4961275785).

8278271991 is a wasteful number, since it uses less digits than its factorization.

8278271991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55652 (or 55638 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 54.

The square root of 8278271991 is about 90985.0097048959. The cubic root of 8278271991 is about 2022.9255383285.

The spelling of 8278271991 in words is "eight billion, two hundred seventy-eight million, two hundred seventy-one thousand, nine hundred ninety-one".