18728215200 has 288 divisors, whose sum is σ = 68749974720. Its totient is φ = 4919270400.

The previous prime is 18728215183. The next prime is 18728215271. The reversal of 18728215200 is 251282781.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×18728215200² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1440730 + ... + 1453670.

It is an arithmetic number, because the mean of its divisors is an integer number (238715190).

Almost surely, 2^18728215200 is an apocalyptic number.

18728215200 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 18728215200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34374987360).

18728215200 is an abundant number, since it is smaller than the sum of its proper divisors (50021759520).

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

18728215200 is a wasteful number, since it uses less digits than its factorization.

18728215200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13037 (or 13018 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

Adding to 18728215200 its reverse (251282781), we get a palindrome (18979497981).

The spelling of 18728215200 in words is "eighteen billion, seven hundred twenty-eight million, two hundred fifteen thousand, two hundred".