18309647312 has 80 divisors (see below), whose sum is σ = 40790692800. Its totient is φ = 7874104320.

The previous prime is 18309647299. The next prime is 18309647339. The reversal of 18309647312 is 21374690381.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2862614 + ... + 2869002.

It is an arithmetic number, because the mean of its divisors is an integer number (509883660).

Almost surely, 2^18309647312 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 18309647312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20395346400).

18309647312 is an abundant number, since it is smaller than the sum of its proper divisors (22481045488).

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

18309647312 is a wasteful number, since it uses less digits than its factorization.

18309647312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7284 (or 7278 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 18309647312 in words is "eighteen billion, three hundred nine million, six hundred forty-seven thousand, three hundred twelve".