18730748720720 has 20 divisors (see below), whose sum is σ = 43548990775860. Its totient is φ = 7492299488256.

The previous prime is 18730748720699. The next prime is 18730748720729. The reversal of 18730748720720 is 2702784703781.

It can be written as a sum of positive squares in 2 ways, for example, as 10449107970064 + 8281640750656 = 3232508^2 + 2877784^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18730748720729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117067179425 + ... + 117067179584.

It is an arithmetic number, because the mean of its divisors is an integer number (2177449538793).

Almost surely, 2^{18730748720720} is an apocalyptic number.

18730748720720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18730748720720 is an abundant number, since it is smaller than the sum of its proper divisors (24818242055140).

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

18730748720720 is a wasteful number, since it uses less digits than its factorization.

18730748720720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234134359022 (or 234134359016 counting only the distinct ones).

The product of its (nonzero) digits is 7375872, while the sum is 56.

The spelling of 18730748720720 in words is "eighteen trillion, seven hundred thirty billion, seven hundred forty-eight million, seven hundred twenty thousand, seven hundred twenty".