8117822578 has 4 divisors (see below), whose sum is σ = 12176733870. Its totient is φ = 4058911288.

The previous prime is 8117822569. The next prime is 8117822627. The reversal of 8117822578 is 8752287118.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6507164889 + 1610657689 = 80667^2 + 40133^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2029455643 + ... + 2029455646.

Almost surely, 2^8117822578 is an apocalyptic number.

8117822578 is a deficient number, since it is larger than the sum of its proper divisors (4058911292).

8117822578 is a wasteful number, since it uses less digits than its factorization.

8117822578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4058911291.

The product of its digits is 501760, while the sum is 49.

The square root of 8117822578 is about 90098.9599163054. The cubic root of 8117822578 is about 2009.7707367858.

The spelling of 8117822578 in words is "eight billion, one hundred seventeen million, eight hundred twenty-two thousand, five hundred seventy-eight".