1216353600 has 504 divisors, whose sum is σ = 5394886848. Its totient is φ = 252518400.

The previous prime is 1216353581. The next prime is 1216353679. The reversal of 1216353600 is 63536121.

1216353600 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 3 + 53 + 600 = 666.

It is a tau number, because it is divible by the number of its divisors (504).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1108252 + ... + 1109348.

Almost surely, 2^1216353600 is an apocalyptic number.

1216353600 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 1216353600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2697443424).

1216353600 is an abundant number, since it is smaller than the sum of its proper divisors (4178533248).

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

1216353600 is a wasteful number, since it uses less digits than its factorization.

1216353600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143 (or 1125 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 1216353600 is about 34876.2612675155. The cubic root of 1216353600 is about 1067.4641085436.

Adding to 1216353600 its reverse (63536121), we get a palindrome (1279889721).

The spelling of 1216353600 in words is "one billion, two hundred sixteen million, three hundred fifty-three thousand, six hundred".