18271728308 has 6 divisors (see below), whose sum is σ = 31975524546. Its totient is φ = 9135864152.

The previous prime is 18271728253. The next prime is 18271728317. The reversal of 18271728308 is 80382717281.

It can be written as a sum of positive squares in only one way, i.e., 15069526564 + 3202201744 = 122758^2 + 56588^2 .

It is a super-2 number, since 2×18271728308² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2283966035 + ... + 2283966042.

It is an arithmetic number, because the mean of its divisors is an integer number (5329254091).

Almost surely, 2^18271728308 is an apocalyptic number.

It is an amenable number.

18271728308 is a deficient number, since it is larger than the sum of its proper divisors (13703796238).

18271728308 is a wasteful number, since it uses less digits than its factorization.

18271728308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4567932081 (or 4567932079 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 47.

The spelling of 18271728308 in words is "eighteen billion, two hundred seventy-one million, seven hundred twenty-eight thousand, three hundred eight".