8172981648 has 100 divisors (see below), whose sum is σ = 25474646428. Its totient is φ = 2514758400.

The previous prime is 8172981643. The next prime is 8172981703. The reversal of 8172981648 is 8461892718.

It can be written as a sum of positive squares in 2 ways, for example, as 4213048464 + 3959933184 = 64908^2 + 62928^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 8172981594 and 8172981603.

It is not an unprimeable number, because it can be changed into a prime (8172981643) by changing a digit.

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 in 19 ways as a sum of consecutive naturals, for example, 225703 + ... + 259398.

Almost surely, 2^8172981648 is an apocalyptic number.

It is an amenable number.

8172981648 is an abundant number, since it is smaller than the sum of its proper divisors (17301664780).

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

8172981648 is a wasteful number, since it uses less digits than its factorization.

8172981648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485134 (or 485119 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The square root of 8172981648 is about 90404.5443990511. The cubic root of 8172981648 is about 2014.3124696181.

The spelling of 8172981648 in words is "eight billion, one hundred seventy-two million, nine hundred eighty-one thousand, six hundred forty-eight".