18028206240 has 864 divisors, whose sum is σ = 71887798080. Its totient is φ = 3771187200.

The previous prime is 18028206233. The next prime is 18028206241. The reversal of 18028206240 is 4260282081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18028206241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 581555025 + ... + 581555055.

It is an arithmetic number, because the mean of its divisors is an integer number (83203470).

Almost surely, 2^18028206240 is an apocalyptic number.

18028206240 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 18028206240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35943899040).

18028206240 is an abundant number, since it is smaller than the sum of its proper divisors (53859591840).

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

18028206240 is a wasteful number, since it uses less digits than its factorization.

18028206240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The spelling of 18028206240 in words is "eighteen billion, twenty-eight million, two hundred six thousand, two hundred forty".