8278779591 has 12 divisors (see below), whose sum is σ = 11975112760. Its totient is φ = 5511397680.

The previous prime is 8278779589. The next prime is 8278779623. The reversal of 8278779591 is 1959778728.

It is not a de Polignac number, because 8278779591 - 2¹ = 8278779589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8278779791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 642325 + ... + 655086.

Almost surely, 2^8278779591 is an apocalyptic number.

8278779591 is a deficient number, since it is larger than the sum of its proper divisors (3696333169).

8278779591 is a wasteful number, since it uses less digits than its factorization.

8278779591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298126 (or 1298123 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 63.

The square root of 8278779591 is about 90987.7991326310. The cubic root of 8278779591 is about 2022.9668841560.

The spelling of 8278779591 in words is "eight billion, two hundred seventy-eight million, seven hundred seventy-nine thousand, five hundred ninety-one".