18200000280 has 256 divisors, whose sum is σ = 71033241600. Its totient is φ = 3617349120.

The previous prime is 18200000261. The next prime is 18200000281. The reversal of 18200000280 is 8200000281.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18200000281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 169701 + ... + 255339.

It is an arithmetic number, because the mean of its divisors is an integer number (277473600).

Almost surely, 2^18200000280 is an apocalyptic number.

18200000280 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 18200000280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35516620800).

18200000280 is an abundant number, since it is smaller than the sum of its proper divisors (52833241320).

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

18200000280 is a wasteful number, since it uses less digits than its factorization.

18200000280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85694 (or 85690 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Subtracting from 18200000280 its reverse (8200000281), we obtain a palindrome (9999999999).

The spelling of 18200000280 in words is "eighteen billion, two hundred million, two hundred eighty", and thus it is an aban number.