18278991360 has 800 divisors, whose sum is σ = 76646433600. Its totient is φ = 4161798144.

The previous prime is 18278991359. The next prime is 18278991371. The reversal of 18278991360 is 6319987281.

18278991360 is a `hidden beast` number, since 1 + 8 + 278 + 9 + 9 + 1 + 360 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 18278991297 and 18278991306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 71124352 + ... + 71124608.

It is an arithmetic number, because the mean of its divisors is an integer number (95808042).

Almost surely, 2^18278991360 is an apocalyptic number.

18278991360 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 18278991360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38323216800).

18278991360 is an abundant number, since it is smaller than the sum of its proper divisors (58367442240).

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

18278991360 is an frugal number, since it uses more digits than its factorization.

18278991360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 18278991360 in words is "eighteen billion, two hundred seventy-eight million, nine hundred ninety-one thousand, three hundred sixty".