1820228587200 has 672 divisors, whose sum is σ = 7016724234240. Its totient is φ = 458265600000.

The previous prime is 1820228587123. The next prime is 1820228587201. The reversal of 1820228587200 is 27858220281.

1820228587200 is a `hidden beast` number, since 1 + 8 + 20 + 2 + 28 + 587 + 20 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1820228587201) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 54890625 + ... + 54923775.

It is an arithmetic number, because the mean of its divisors is an integer number (10441553920).

Almost surely, 2^{1820228587200} is an apocalyptic number.

1820228587200 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 1820228587200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3508362117120).

1820228587200 is an abundant number, since it is smaller than the sum of its proper divisors (5196495647040).

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

1820228587200 is a wasteful number, since it uses less digits than its factorization.

1820228587200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33254 (or 33233 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 45.

The spelling of 1820228587200 in words is "one trillion, eight hundred twenty billion, two hundred twenty-eight million, five hundred eighty-seven thousand, two hundred".