18244327638 has 32 divisors (see below), whose sum is σ = 37723640832. Its totient is φ = 5876215200.

The previous prime is 18244327603. The next prime is 18244327643. The reversal of 18244327638 is 83672344281.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46353 + ... + 196563.

It is an arithmetic number, because the mean of its divisors is an integer number (1178863776).

Almost surely, 2^18244327638 is an apocalyptic number.

18244327638 is an abundant number, since it is smaller than the sum of its proper divisors (19479313194).

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

18244327638 is a wasteful number, since it uses less digits than its factorization.

18244327638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150900.

The product of its digits is 1548288, while the sum is 48.

The spelling of 18244327638 in words is "eighteen billion, two hundred forty-four million, three hundred twenty-seven thousand, six hundred thirty-eight".