18306436720 has 320 divisors, whose sum is σ = 52270404480. Its totient is φ = 5872435200.

The previous prime is 18306436699. The next prime is 18306436739. The reversal of 18306436720 is 2763460381.

It is a Harshad number since it is a multiple of its sum of digits (40).

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 in 63 ways as a sum of consecutive naturals, for example, 25819726 + ... + 25820434.

It is an arithmetic number, because the mean of its divisors is an integer number (163345014).

Almost surely, 2^18306436720 is an apocalyptic number.

18306436720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18306436720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26135202240).

18306436720 is an abundant number, since it is smaller than the sum of its proper divisors (33963967760).

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

18306436720 is a wasteful number, since it uses less digits than its factorization.

18306436720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844 (or 838 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 18306436720 in words is "eighteen billion, three hundred six million, four hundred thirty-six thousand, seven hundred twenty".