18380807720 has 32 divisors (see below), whose sum is σ = 45116529120. Its totient is φ = 6683929920.

The previous prime is 18380807717. The next prime is 18380807747. The reversal of 18380807720 is 2770808381.

It is a super-3 number, since 3×18380807720³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20886842 + ... + 20887721.

It is an arithmetic number, because the mean of its divisors is an integer number (1409891535).

Almost surely, 2^18380807720 is an apocalyptic number.

18380807720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18380807720 is an abundant number, since it is smaller than the sum of its proper divisors (26735721400).

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

18380807720 is a wasteful number, since it uses less digits than its factorization.

18380807720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41774585 (or 41774581 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 44.

The spelling of 18380807720 in words is "eighteen billion, three hundred eighty million, eight hundred seven thousand, seven hundred twenty".