18309473280 has 1320 divisors, whose sum is σ = 82337103288. Its totient is φ = 3864526848.

The previous prime is 18309473269. The next prime is 18309473323. The reversal of 18309473280 is 8237490381.

18309473280 is a `hidden beast` number, since 18 + 309 + 4 + 7 + 328 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5563966464 + 12745506816 = 74592^2 + 112896^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 345461734 + ... + 345461786.

Almost surely, 2^18309473280 is an apocalyptic number.

18309473280 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 18309473280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41168551644).

18309473280 is an abundant number, since it is smaller than the sum of its proper divisors (64027630008).

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

18309473280 is a wasteful number, since it uses less digits than its factorization.

18309473280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 18309473280 in words is "eighteen billion, three hundred nine million, four hundred seventy-three thousand, two hundred eighty".