8172818944 has 40 divisors (see below), whose sum is σ = 16424244540. Its totient is φ = 4062744576.

The previous prime is 8172818939. The next prime is 8172818959. The reversal of 8172818944 is 4498182718.

It can be written as a sum of positive squares in 2 ways, for example, as 8157702400 + 15116544 = 90320^2 + 3888^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8172818891 and 8172818900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42442 + ... + 134710.

Almost surely, 2^8172818944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8172818944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8212122270).

8172818944 is an abundant number, since it is smaller than the sum of its proper divisors (8251425596).

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

8172818944 is an equidigital number, since it uses as much as digits as its factorization.

8172818944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92460 (or 92444 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 52.

The square root of 8172818944 is about 90403.6445283043. The cubic root of 8172818944 is about 2014.2991028573.

The spelling of 8172818944 in words is "eight billion, one hundred seventy-two million, eight hundred eighteen thousand, nine hundred forty-four".