18816738280 has 64 divisors (see below), whose sum is σ = 43208081280. Its totient is φ = 7373203200.

The previous prime is 18816738257. The next prime is 18816738287. The reversal of 18816738280 is 8283761881.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18816738287) 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, 465685 + ... + 504475.

It is an arithmetic number, because the mean of its divisors is an integer number (675126270).

Almost surely, 2^18816738280 is an apocalyptic number.

18816738280 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 18816738280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21604040640).

18816738280 is an abundant number, since it is smaller than the sum of its proper divisors (24391343000).

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

18816738280 is a wasteful number, since it uses less digits than its factorization.

18816738280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39050 (or 39046 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 52.

The spelling of 18816738280 in words is "eighteen billion, eight hundred sixteen million, seven hundred thirty-eight thousand, two hundred eighty".