8081261864 has 32 divisors (see below), whose sum is σ = 16370132520. Its totient is φ = 3717881856.

The previous prime is 8081261863. The next prime is 8081261869. The reversal of 8081261864 is 4681621808.

It can be written as a sum of positive squares in 4 ways, for example, as 2385540964 + 5695720900 = 48842^2 + 75470^2 .

It is not an unprimeable number, because it can be changed into a prime (8081261863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91577 + ... + 156680.

Almost surely, 2^8081261864 is an apocalyptic number.

It is an amenable number.

8081261864 is an abundant number, since it is smaller than the sum of its proper divisors (8288870656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8081261864 is a wasteful number, since it uses less digits than its factorization.

8081261864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248589 (or 248585 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 44.

The square root of 8081261864 is about 89895.8389693316. The cubic root of 8081261864 is about 2006.7490217350.

The spelling of 8081261864 in words is "eight billion, eighty-one million, two hundred sixty-one thousand, eight hundred sixty-four".