18280000000 has 160 divisors (see below), whose sum is σ = 45755156304. Its totient is φ = 7296000000.

The previous prime is 18279999979. The next prime is 18280000001. The reversal of 18280000000 is 8281.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 14181951744 + 4098048256 = 119088^2 + 64016^2 .

It is a tau number, because it is divible by the number of its divisors (160).

It is not an unprimeable number, because it can be changed into a prime (18280000001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39999772 + ... + 40000228.

Almost surely, 2^18280000000 is an apocalyptic number.

18280000000 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 18280000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22877578152).

18280000000 is an abundant number, since it is smaller than the sum of its proper divisors (27475156304).

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

18280000000 is an frugal number, since it uses more digits than its factorization.

18280000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 18280000000 its reverse (8281), we get a palindrome (18280008281).

The spelling of 18280000000 in words is "eighteen billion, two hundred eighty million", and thus it is an aban number.