1215244800 has 720 divisors, whose sum is σ = 5461739712. Its totient is φ = 250675200.

The previous prime is 1215244799. The next prime is 1215244853. The reversal of 1215244800 is 84425121.

1215244800 is a `hidden beast` number, since 1 + 215 + 2 + 448 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 8870332 + ... + 8870468.

Almost surely, 2^1215244800 is an apocalyptic number.

1215244800 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 1215244800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2730869856).

1215244800 is an abundant number, since it is smaller than the sum of its proper divisors (4246494912).

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

1215244800 is a wasteful number, since it uses less digits than its factorization.

1215244800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 1215244800 is about 34860.3614439093. The cubic root of 1215244800 is about 1067.1396513478.

Adding to 1215244800 its reverse (84425121), we get a palindrome (1299669921).

The spelling of 1215244800 in words is "one billion, two hundred fifteen million, two hundred forty-four thousand, eight hundred".